单选题：You enter the command

You enter the command
```
cat Makefile | sort > List &
and the operating system displays
[2] 3566
```
What does this mean? @[A](1)
A. This is job number 2 and the PID of the sort command is 3566.
B. This is job number 2 and the PID of the job is 3566.
C. This is job number 3566 and the PID of the cat command is 2.
D. This is job number 2 and the PID of the cat command is 3566.




A.This is job number 2 and the PID of the sort command is 3566.
B.This is job number 2 and the PID of the job is 3566.
C.This is job number 3566 and the PID of the cat command is 2.
D.This is job number 2 and the PID of the cat command is 3566.


答案：A