Which of the following is not an implied term?

The choice indicating that lien rights may be waived in advance of performing the work is identified as not being an implied term, and this is because implied terms are generally understood to exist based on the nature of the agreement and the context of the work being performed, without needing explicit affirmation in the contract itself.

Liens are legal claims against property that can help ensure payment to contractors and subcontractors for their work. The ability to waive these rights typically requires a clear, explicit agreement to avoid any confusion or potential injustice. Therefore, such a waiver cannot be assumed or implied; it must be articulated explicitly within the contract terms.

In contrast, the other options reflect typical expectations in contractual relationships. Payment upon completion of work is a common and understood practice unless stated otherwise. Requirements for a final affidavit are also standard to ensure that all parties involved have been compensated before the contractor receives final payment. The expectation that parties will cooperate and not hinder each other's performance reflects a foundational standard in contract performance, promoting fair play and good faith among involved parties. Thus, these represent implied terms inherent in contractual agreements.