What is a contract of precarium?

• A. It is a contract by virtue of which a person called the guarantor, binds himself to the creditor to fulfill the obligation of the principal debtor in case the latter should fail to do so.
• B. It is a contract by virtue of which a person binds himself solidarily with the principal debtor to fulfill the obligation.
• C. It is an accessory, real and unilateral contract by virtue of which the debtor or a third person delivers to the creditor or to a third person movable property as security for the performance of the principal obligation.
• D. It is a contract of commodatum where the bailor has the right to demand the return of the thing which is the object of the contract at will.