2. As a way of avoiding busy waiting when getting input, interrupts were discussed in class. Interrupts are handled by an interrupt service routine, or ISR, in the operating system. Before an interrupt service routine is executed, certain information related to the subroutine which is currently executing must be saved by the CPU (or by the operating system; do not concern yourself with who saves it; we are concerned here with what information needs to be saved). a. What kinds of information must be saved? b. Where is this information saved