During the acquisition process, the potential buyer must sign a which is an agreement to keep all conversations and information secret and legally binds the buyer from telling anyone any information the seller shares with him / her.

b) nondisclosure statement

Explanation:

Based on the scenario being described within the question it can be said that the individual in this scenario must sign a Non-disclosure agreements. Like mentioned in the statement this is a legal contract that prohibits the signing individual from revealing any confidential information to anyone other than the parties involved with the contract. This contract is legally binding and is used in many situation in which confidential information is involved.

don't use it that much