$58-$Restitution occurs when one party seeks to undo a contract and return to its position before the contract was made. Restitution often occurs when fraud and mutual mistake occur and enforcing the contract would be unjust. Restitution may also be available when one party materially breaches the contract to such an extent that requiring the other party to perform would be unjust. Find the correct answer

$$ a$-$ true

$$ b$-$ false