Which command ensures new files created in a directory inherit the directory's group ownership by setting the setgid bit?

• A. chmod g+rw marketing
• B. chmod g+srw marketing
• C. chmod g+s marketing
• D. chmod g+rx marketing

Answer: (B)

Setting the setgid bit on a directory makes new files and subdirectories created inside that directory inherit the directory’s group ownership. This ensures collaborative work by a specific group without each user’s primary group affecting ownership. To enable this behavior, you use a chmod form that includes the setgid bit for the group, such as g+s. You can also combine it with other group permissions (for example, g+rw) if you want the group to have those rights inside the directory. Among the options, the one that includes the setgid bit is the one that ensures inheritance, and it’s common to pair it with group read/write so the group can work effectively in that directory. The other choices either omit the setgid bit or don’t specify it, so they won’t guarantee the inheritance behavior.