Comprehensive and Detailed Explanation From Exact Extract:

Standard context definitions provided by Salesforce are locked and cannot be edited or deactivated.

Revenue Lifecycle Management Implementation Guide states:

“Standard context definitions cannot be modified directly.”

“To customize them, admins may either extend (create a child version) or clone them.”

Only these two actions are supported for customizing context behavior.

Why other options are incorrect:

Standard definitions cannot be edited or deactivated.

“Copy” is not an action available; the correct action is “Clone.”