Which of the following commands prints a list of usernames (first column) and their primary group (fourth column) from the /etc/passwd file?

Which of the following commands prints a list of usernames (first column) and their primary group (fourth column) from the /etc/passwd file?
A . fmt Cf 1,4 /etc/passwd
B . cut Cd : -f 1,4 /etc/passwd
C . sort Ct : -k 1,4 /etc/passwd
D . paste Cf 1,4 /etc/passwd
E . split Cc 1,4 /etc/passwd

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Answer: B