you need to modify the group membership for the cjensen user to add the staff group to his list of secondary group memberships. he needs to keep his existing secondary group memberships. which command option will add cjensen to the staff group without removing him from the other groups?

Use the groupadd command. groupadd is usually preferable for scripting (say, if you want to make users in batch), whereas addgroup is more user friendly (especially if you are unknown with all the options and flags).What is the difference between Addgroup and groupadd? groupadd is usually preferable for scripting (say, if you want to make users in batch), whereas addgroup is more user friendly (especially if you are unknown with all the options and flags).groupadd command constructs a new group account using the values selected on the command line and the defaulting values from the system. The new group will be documented in the system files as needed.The difference between useradd and usermod is that the one-time is used for constructing new users and the latter is used for modifying existing users. While useradd can define a Linux user's settings, it accomplishes so for new users, not living usersTo learn more about :  groupadd Ref : https://brainly.com/question/14283785#SPJ4