For the problems in this exercise, assume that there are no pipeline stalls and that the breakdown of executed instructions is as follows: add addi not beq lw sw
20% 20% 0% 25% 25% 10%
a) In what fraction of all cycles is the data memory used?
b) In what fraction of all cycles is the input of the sign-extend circuit needed? What is this circuit doing in cycles in which its input is not needed?

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.

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