Which programs benefit from multiprogramming? One I/O bound program and one CPU bound program One memory bound program and one CPU bound program Two CPU bound programs Two I/O bound programs ACPU is underutilized during certain phases of an application lifecycle. What should be used to increase CPU usage? User mode Multiprogramming Abstraction Kernel mode What describes processes and threads with a blocking system call of a single process control block (PCB)? Choose 2 answers. If one process is blocked, no other process can execute until the first process is unblocked. If one thread is blocked, the next thread in the same task can be executed. If one process is blocked, the next process in the same task can be executed. If one thread is blocked, no other thread can execute until the first thread is unblocked. How do threads increase the efficiency of the operating system (OS)? Create additional process control blocks (PCBs) for each process Eliminate the need to create separate process control blocks (PCBs) Limit the number of running processes Terminate one process when another one starts