After an insured dies, the named beneficiary submits a claim. The insurer requests a certified death certificate and proof of beneficiary identity before paying. The insurer's right to require these items reflects which characteristic of the insurance contract?

Why this is the answer

Insurance policies are conditional contracts: the insurer's promise to pay is conditioned on the insured (or beneficiary) satisfying specific policy conditions, including timely premium payment, prompt notice of claim, proof of loss, and cooperation. Requesting a death certificate and proof of beneficiary identity is the insurer's invocation of those policy conditions. Unilateral describes the one-sided promise structure, aleatory the unequal-value exchange, and personal the non-assignability of property policies — none describes the claim-payment-conditions feature. Per the Florida Agent's Health & Life Exam Content Outline §II.D.2.a.