An insurer is obligated to pay legitimate claims, but the policyowners are NOT obligated to pay insurance premiums. This characteristic implies which type of contract?

Aleatory contracts involve an element of chance, where the outcomes depend on uncertain events, such as the occurrence of a loss. While insurance contracts can be considered aleatory because the insurer pays claims based on uncertain future events, this characteristic does not capture the essence of one party's obligation versus the other's lack thereof.

Adhesion contracts are those drafted by one party (usually the insurer) and presented to the other party (the policyowner) on a "take it or leave it" basis, with no opportunity for negotiation. Although insurance contracts often fit this definition, it does not address the specific obligation disparity that distinguishes unilateral contracts.

Conditional contracts require certain conditions to be met for the obligations to be enforced, such as the payment of premiums to activate the insurer's duty to pay claims. While insurance policies are indeed conditional, this term does not emphasize the key aspect of unilateral contracts, which is the one-sided obligation of the insurer.