单选题：Which of these process properties is not retained when you set t

Which of these process properties is not retained when you set the program a process is executing with an exec system call?@[B](1)
A. process ID
B. variable values
C. open file descriptors
D. parent’s process ID



A.process ID
B.variable values
C.open file descriptors
D.parent’s process ID


答案：B