Final answer:
To remove a tag from a commit in Git, use the command 'git tag -d TAGNAME', replacing 'TAGNAME' with the actual tag name, and then push the deletion to a remote repository if needed.
Step-by-step explanation:
The question pertains to the version control system Git, specifically on how to remove a tag from a commit. Among the options given, the correct command to remove a tag is git tag -d TAGNAME, where TAGNAME is the name of the tag you want to delete. Here's an example of its usage:
git tag -d v1.0.0
This command will delete the tag 'v1.0.0' from your local repository. If you wish to remove the tag from a remote repository, you'd first remove it locally with the above command, then push the deletion to the remote with:
git push origin :refs/tags/v1.0.0
It is important to note that option B, C, and D are not valid Git commands.