A disk drive’s data rate is a summary performance number combining the physical aspects of data access with the electronic aspects of data transfer to the disk controller or system.

Transfer

Explanation:

A disk drive’s data TRANSFER rate is a summary performance number combining the physical aspects of data access with the electronic aspects of data transfer to the disk controller or system.

A data transfer rate is the quantity of data that can be transferred from one point to another within a given time frame.

given the options, i would say your best bet is c. the modem supports up to 56 kbps, which is too low for video streaming. dial up modems use actual phone lines, which only can go up to 56 kbps as that's more than sufficient for traditional phone calls. this is also the reason why when a dial-up modem connects, you hear all those sounds. it's literally using the phone line to establish a connection.