单选题：Which of the following is incorrect?

Which of the following is incorrect? @[C](1)
A. The system call “fork” may just duplicate the thread that invoked it.
B. The system call “fork” may duplicate all the threads of a process.
C. The system call “exec” may just replace the thread that invoked it.
D. The system call “exec” may replace the entire process.





A.The system call “fork” may just duplicate the thread that invoked it.
B.The system call “fork” may duplicate all the threads of a process.
C.The system call “exec” may just replace the thread that invoked it.
D.The system call “exec” may replace the entire process.


答案：C