21 (Choose only one answer) The table contains the base address of each page in physical memory. out of Select one: O a. memory O b. page . process O d. frame n 22 (Choose only one answer) When a program tries to access a page that is mapped in the address space but is not loaded in physical memory, then ed out of Select one: O a. fatal error occurs O b. segmentation fault occurs O c. page fault occurs O d. none of the mentioned in 23 (Choose only one answer) To access the services of the operating system, the interface is provided by the ed out of Select one: O a. Library O b. Assembly instructions O c. System calls O d. API n 24 (Choose only one answer) What is the objective of multiprogramming? ed out of Select one: a. None of the mentioned O b. To increase CPU utilization O c. Have a process running at all time O d. Have multiple programs waiting in a queue ready to run 25 (Choose only one answer) If a process is executing in its critical section, then no other processes can be executing in their critical section. What is this condition called out of Select one: O a. mutual exclusion O b. synchronous exclusion O c. asynchronous exclusion O d. critical exclusion