What must be true for the terms of an offer?

For the terms of an offer to be valid, they must create a legal obligation. This means that when an offer is accepted, it results in a binding contract that legally obligates both parties to fulfill their promises as outlined in the offer. Legal obligation is a fundamental principle of contract law, ensuring that there is a clear intention to create legal relations and that the terms of the offer are specific enough for the parties to understand their rights and responsibilities.

Other options might suggest various aspects regarding the form and discussion of an offer, but they do not address the essential requirement of establishing a legal obligation as part of a contractual relationship. For instance, while an offer can sometimes include negotiable terms, this is not a universal requirement; offers can be firm and not subject to negotiation. Similarly, a signature is not necessary for all forms of offers, particularly in informal contracts, and they do not have to be discussed verbally since written or implied offers are valid as well.