Which of the following are elements of a valid contract?

Two elements of a valid contract are offer and acceptance. An offer is a proposal made by one party to another, indicating a willingness to enter into a contract on certain terms. Acceptance occurs when the other party agrees to the terms of the offer. Age and maturity are not elements of a valid contract, as they refer to personal characteristics of the parties involved rather than contractual requirements. Performance and discharge, on the other hand, are related to the fulfillment of contractual obligations and the completion of the contract, rather than its formation. While important aspects of contract law, they are not elements of a valid contract. Promise and capacity are related to the ability of the parties to enter into a contract and their intention to be legally bound, respectively. While important concepts in contract law, they are not elements of a valid contract on their own.