Traps and interrupts are mechanisms used to transfer control between user-level processes and the operating system. Tell us where we can find the first C-language function of OS/161 that is executed when a trap occurs. Then, tell us where control gets transferred to from that point (i.e., what function services the trap). Be sure to describe the control flow for each type of trap that may occur (e.g., system calls, VM faults, and hardware interrupt).