When an insurer's duty to pay a claim depends on the insured first meeting requirements such as paying premiums and submitting proof of loss, the contract is:

解析

A conditional contract requires certain conditions to be met before either party must perform; the insured must pay premiums and file the proper claim documentation, and only then is the insurer obligated to pay. Unilateral refers to only one party making an enforceable promise. Aleatory refers to the unequal, chance-based exchange of value. Executed means fully performed, which an ongoing insurance policy is not. These characteristics often appear together but describe distinct features.