Question about Marvin claims in Nevada

I wanted to clarify if my understanding of "palimony" is correct.

A) True/false: Marvin claims are settled in civil court and can't be altered after judgement, alimony claims are settled in family court and can be altered after.

B) True/false: A legitimately agreed Cohabitation Agreement (both lawyers present, language verified by an attorney, etc) as an express written contract would supercede any alleged implied verbal contract.

C) Can that agreement stipulate the waiver of rights to even file a Marvin claim?

D) In the presence of such a contract, am I able to "hold out" my partner as my spouse (seeing as there's no common law marriage in nevada) without legal repercussions?