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A systems administrator is reconfiguring existing user accounts in a Linux system. Which of the following commands should the administrator use to include "myuser" in the finance group?
Correct Answer: D
Comprehensive and Detailed Explanation From Exact Extract: To add an existing user (myuser) to an existing group (finance) without removing them from other groups, the correct command is usermod -aG finance myuser. The -aG option appends the user to the supplementary group (s) specified. Other options: * A. groupadd is for creating new groups, not adding users to groups. * B. groupmod is for modifying group properties, not user membership. * C. useradd creates new users; not applicable to existing users. Reference: CompTIA Linux+ Study Guide: Exam XK0-005, Sybex, Chapter 6: "User and Group Management", Section: "Modifying Group Membership" CompTIA Linux+ XK0-005 Objectives, Domain 1.0: System Management