How can an offeror create a valid contract if an offer is accepted after the offer period has expired?

To create a valid contract after the expiration of an offer period, having the offeror sign a waiver of the offer period is a legitimate approach. This action involves the offeror intentionally relinquishing their right to enforce the time constraints of the original offer, essentially allowing acceptance to be valid even after the stipulated time has lapsed.

This concept is rooted in contract law, where parties have the freedom to modify terms and conditions, as long as both parties mutually agree. By waiving the time limitation, the offeror indicates their willingness to proceed with the acceptance even when it technically exceeds the original deadline.

The other options involve potential steps but do not directly enable a valid acceptance after an expired offer. Revising the original offer essentially restarts the offer period instead of recognizing an acceptance after it has expired. Establishing a new period also suggests a fresh offer rather than addressing the timeline of the original agreement. Negotiating a new agreement, while a valid approach, would not specifically validate an acceptance of the expired offer but would instead involve creating an entirely new contract.