D) Conditions precedent, conditions subsequent, and concurrent conditions are the three types of conditions.
A condition precedent is an event that must take place before the parties are required to perform in a contract. For instance, if a customer's home is destroyed by fire during the policy period, an insurance contract may mandate that the insurer cover the cost of rebuilding it. The fire is a precedent condition.
A condition subsequent is a situation or event that will end one party's obligation to the other if it occurs. The fact that a condition subsequent takes effect after a party has already assumed a duty or an interest has already vested distinguishes it from similar condition precedents.
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