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 -f 1,4 /etc/passwd
B. cut -d : -f 1,4 /etc/passwd
C. sort -t : -k 1,4 /etc/passwd
D. paste -f 1,4 /etc/passwd
E. split -c 1,4 /etc/passwd
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