单选题：What is a context switch?

What is a context switch?@[B](1)
A. The process state needed to switch from one to another.
B. The process used to switch from one executing process to another
C. The switching of a process from user mode to superuser mode
D. The process of changing the priority of a process.





A.The process state needed to switch from one to another.
B.The process used to switch from one executing process to another
C.The switching of a process from user mode to superuser mode
D.The process of changing the priority of a process.


答案：B