QUESTION TWO [20 Marks] A) From the point of view of the device driver, data may be read from an I/O device
using polling, Interrupt-driven programmed I/O, or Direct Memory Access(DMA).
Required:- Explain each of above terms, and in each case outline using pseudo-code
(or a flow chart) the flow of control in the device driver when reading data from
the device.
[14 Marks]
B) Give an example situation in which operating systems effectively consider disk storage to
be a fourth type of memory".
[2 Marks]
C) Explain the operation of a multi-level feedback queue in process scheduling. [4 Marks]

c- dynamic stretching

exercising at a moderate intensity, and slowly increasing the duration.

if you think your dog may have been exposed to a toxin, the best thing to do is to check the label of the item you think your pet ingested. read the information about toxicity. often, but not always, the information on packaging regarding children is relevant to dogs and some manufacturers even discuss dog toxicity. if there is an 800 number on the package – call them! it’s also recommended that you call your veterinarian to confirm the recommendations. if you go to your veterinarian, take all packaging and any information you have on the product.