Linux Foundation Certified System Administrator (LFCS) — Question 114

Which of the following files assigns a user to its primary group?

Answer options

• A. /etc/pgroup
• B. /etc/shadow
• C. /etc/group
• D. /etc/passwd
• E. /etc/gshadow

Correct answer: D

Explanation

The correct answer is /etc/passwd, as this file contains user account information, including the primary group ID. The other options do not serve this purpose: /etc/group holds group information, /etc/shadow stores secure user password information, /etc/pgroup does not exist in standard Linux distributions, and /etc/gshadow is used for group password and membership details.