Which character or characters separate the cell reference from the sheet name in an external reference

Two technicians are discussing the common u-joint. technician a says its input and output speeds should be equal. technician b says that it normally has two yokes. which technician is correct?

Jenny wants to create an animated short video to add to her website. which software will she use to create this animated video?

Website hosting servers have their own unique ip address, what does this address consist of? a. numbers and letters b. numbers c. letters d. letters and symbols