Which from the following is NOT among essentials of a valid contract?

Which from the following is NOT among essentials of a valid contract?

مندرجہ ذیل میں سے کون سا درست معاہدہ کے لوازمات میں شامل نہیں ہے؟
Explanation
A valid contract requires at least two parties, but it does not require more than two parties.
Free consent, lawful consideration, and consensus ad idem (mutual agreement) are essential elements of a valid contract.