The insurance broker, prior to the effective date of the policy, shall deliver written notice to the prospective insured disclosing the relationship between the insurance broker and the controlled insurer, except that, if the business is placed through an insurance broker who is not a controlling insurance broker, the controlling insurance broker shall retain a signed commitment from the insurance broker that the insurance broker is aware of the relationship between the insurer and the insurance broker and that the insurance broker has or will notify the insured.