Select all that are true regarding the process control block 

When CPU switches to another process, the system must save the state of the old process (to PCB) and load the saved state (from PCB) for the new process via a context switch

A process control block contains the address of the next instruction to be executed by the process 

The purpose of the process control block is to store information needed for the scheduler to select, schedule and manage processes

A process control block contains information about the amount of CPU used

A process control blocks contains copies of programs that are scheduled for execution