California Civil Code 2079 does NOT require:

The reasoning behind the selection of the correct answer lies in the specific provisions of California Civil Code 2079, which primarily focuses on the obligations of real estate agents concerning agency disclosure in residential transactions. This section of the code mandates that agents provide written disclosures regarding the nature of their agency relationship with the clients involved in residential property sales.

In the context of business opportunity transactions, the law does not specifically require an agency disclosure form under Civil Code 2079, making it clear that this requirement is tailored towards residential real estate dealings. Therefore, the absence of a mandatory agency disclosure form for business opportunities aligns with the stipulations set forth in this legal framework.

On the other hand, the other options relate directly to responsibilities that are emphasized in California Civil Code 2079. The code requires acknowledgment that the agency relationships exist between the parties involved, necessitating written disclosures in residential transactions, and confirming these agency relationships in sale agreements. These components are crucial for transparency and protecting the interests of all parties in real estate dealings. Thus, option A is correct as it identifies a requirement that is not mandated by the code.