answer all parts of 2

Question 2: Circle the right Answer In what way is an operating system like a "illusionist"? a. guarantees that every process' address space is like a lockbox b. guarantees that every process gets a fair time in CPU. c. enables process concurrency on a uni-processor system. d. offers common os services to all users and processes. A Process Control Block (PCB) is: a. A structure that stores information about a single process b. The kernel's structure of keeping track of all the processes in the system. c. A linked list of blocked processes (waiting on some event). d. A kernel interface for controlling processes (creating, deleting, suspending)