Admin User Unable to Modify "changes" File

C.

Based on the provided output, the file "changes" has the following permissions:

• The owner of the file has read, write, and execute permissions.
• The group "Admins" has read, write, and execute permissions.
• There is an additional permission setting called an FACL, which is denoted by the "+" symbol at the end of the permission string.

An FACL (File Access Control List) is an additional permission setting that can be used in conjunction with the traditional Unix file permissions to provide more granular control over file access. It allows for more specific permissions to be set for individual users or groups, in addition to the owner and group permissions.

In this case, since the admins group has write permissions to the file, it is unlikely that the issue is related to inadequate permissions. Additionally, the SELinux mode of the server is not provided, so it cannot be determined if it is related to the issue.

Therefore, the most likely explanation for why the user is unable to modify the "changes" file is the presence of an FACL, which may be restricting the user's access to the file. The specific FACL would need to be examined to determine which permissions have been set and why the user is unable to modify the file.