Bernie wants to use matrix-based security to execute a particular command in a Jenkins pipeline, but they do not have any relevant groups and they are not allowed to create a specific user to run the task. Which of the following can they do?

A: Create a group or reassign the user B: Change workflow to require an existing user to the task, and grant permissions to that group. C: Create a group, add an existing user to run the task or reassign the user D: Set permissions to allow anonymous user to run the command.