Which type of contract may remain partially or completely unfulfilled?

The correct answer is executory. An executory contract is one in which some of the obligations or promises made by one or both parties have not yet been fulfilled. In the context of bail bonds and insurance, this means that certain conditions may still need to be met for the contract to be fully executed. For instance, if a bail bondsman has provided a bond but the defendant has not yet appeared in court, the contract remains executory because the obligations of the bond are still pending completion.

Understanding executory contracts helps in grasping the dynamics of legal agreements where certain actions still need to be enacted to fulfill the terms. Unlike bilateral or unilateral contracts, which can become fully executed once the required actions have been taken, an executory contract inherently acknowledges that not all aspects of the agreement are complete.