Which of the following commands pipes stdout and stderr from cmd1 to cmd2?

A.
cmd2 | cmd1

B.
cmd2 2>&1 | cmd1

C.
cmd1 | cmd2

D.
cmd1 2>&1 | cmd2

Explanation:

The cmd1 2>&1 | cmd2 command pipes stdout and stderr from cmd1 to cmd2.
Answer option C is incorrect. The cmd1 | cmd2 command pipes stdout from cmd1 to cmd2.
Answer option B is incorrect. The cmd2 2>&1 | cmd1 command pipes the stdout and stderr from
cmd2 to cmd1.
Answer option A is incorrect. The cmd2 | cmd1 command pipes stdout from cmd2 to cmd1.