g The interrupt request of a device is connected to IR-7 of a slave 8259 and another device interrupt request is at IR-3 of Master 8259 within the PC architecture. Which device has a higher interrupt priority and what is your reason

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.