It is a contract to do something or not to do something on the happening or non-happening of an event, which is collateral to the contract. Which of the following type of contract is being referred to here?

Wager Conditional Contingent Futuristic

Contingent

Contingent contract, also called as Conditional contract, is a contract to do something or not to do something on the happening or non-happening of an event, which is collateral to the contract. Contingent contracts cannot be enforced until the uncertain future event happens. If the uncertain future event becomes impossible, contingent contracts become void.