B. State true or false. (1 point each) 1. Context switching happens only when the running process voluntarily gives up the CPU. 2. During context switch, the context of a process is stored in the disk. 3. Return from trap (iret) changes the process privilege level from kernel to user. 4. A process can access any i/o devices only through a system call. 5. The system call table contains the handlers for interrupts.