Consider the following relational database schema for booking hotel rooms:Hotel (hotelNo , hotelName, city)Room (roomNo, hotelNo , type, price)Booking (hotelNo, guestNo, dateFrom , dateTo, roomNo)Guest (guestNo, guestName, guestAddress)whereHotel contains hotel details and hotelNo is the primary key;Room contains room details for each hotel and ( roomNo, HotelNo) forms the primary key;Booking contains details of bookings and ( HotelNo, GuestNo, dateFrom) forms the primary key;Guest contains guest details and guestNo is the primary key. Generate the relational algebra for the following queries:1. List all hotels2. List all single rooms with a price below $20 per night3. List the names and cities of all guests4. List the price and type of all rooms at the Grosvenor Hotel5. List all guests currently staying at Grosvenor Hotel.6. List the names of the guests currently having a booking.7. List the details of all rooms at the Grosvenor Hotel, including the name of the guest staying in the room, if the room is occupied.8. List the guest details (guestNo, guestName, and guestAddress) of all guests staying at the Grosvenor Hotel.

Work with a monitor that’s calibrated and profiled. for critical image editing, calibration and profiling are essential. otherwise, the image you see on your monitor looks different on other monitors or when printed.plan to use adjustment layers to adjust the tonal range and color balance of your image. adjustment layers let you go back and make successive tonal adjustments without discarding or permanently modifying data from the image layer. keep in mind that using adjustment layers adds to the file size of the image and demands more ram from your computer. accessing the color and tonal commands in the adjustments panel automatically creates adjustment layers.if you don’t want to use adjustment layers, you can apply adjustments directly to an image layer. remember that some image information is discarded, when making a color or tonal adjustment directly to an image layer.for critical work and maximum preservation of image data, it’s best if the image you work with is 16 bits per channel (16‑bit image) rather than 8 bits per channel (8‑bit image). data is discarded when you make tonal and color adjustments. the loss of image information is more critical in an 8‑bit image than a 16‑bit image. generally, 16‑bit images have a larger file size than 8‑bit images.duplicate or make a copy of the image file. working on a copy of your image preserves the original in the event you want to use the image in its original state.remove any flaws such as dust spots, blemishes, and scratches from the image before making color and tonal adjustments.open the info or histogram panel in expanded view. as you evaluate and correct the image, both panels display invaluable feedback on your adjustments.you can make a selection or use a mask to confine your color and tonal adjustments to part of an image. another way to apply color and tonal adjustments selectively is to set up your document with image components on different layers. color and tonal adjustments are applied to only one layer at a time. only the image components on the targeted layer are affected.

The correct answer would be a.