Answer: Revocable beneficiary
Explanation:
Revocable beneficiary  has the ability to get changed by the policy owner or policy holder without considering or informing beneficiary.This change can happen at any time and  any person can be choosen beneficiary in the policy.
According to the question, husband can be made a revocable beneficiary as the owner of the policy want to have the right of the life policy and also wants her husband to be beneficiary.Thus, she can get to change the policy as per her wish without involving the signature of her husband as he is revocable beneficiary