A waiver of subrogation clause between an owner and a contractor generally means:

Explanation

Subrogation is the insurer's right, after paying its own insured, to step into the insured's shoes and recover from whoever caused the loss. A mutual waiver gives up that recovery, so an insured loss stays with the insurer that was paid to carry it and the project participants do not litigate against each other; it is commonly paired with builder's risk coverage. (c) is the misreading that matters: the coverage still responds, and it is only the insurer's onward claim that is waived. (a) and (b) waive substantive rights a subrogation clause does not touch, and a lien waiver in particular is valid only in the statutory form.