How do you ensure that only a manager can run a specific flow action?

How do you ensure that only a manager can run a specific flow action?
A . Add a privilege to the flow action form, then add the privilege to a role assigned to the access group for managers.
B . Add an Access When condition to the flow action to determine whether the user is a manager.
C . Add a pre-processing activity to the flow action form to determine whether the user is a manager.
D . Add a validate rule to the flow action form to determine whether the user is a manager.

Answer: A

Explanation:

Reference: https://community.pega.com/knowledgebase/articles/security/how-restrict-who-can-use-flow-action