An appraiser wishes to rely on an AVM figure in developing an opinion of value. What is required?

Option B: Written permission from the model's vendor

Vendor permission is a licensing matter between the appraiser and the software provider and says nothing about whether a number is reliable. A properly licensed model can still be wrong for a given property, and an unlicensed one is a contract problem, not a standards problem. Permission never establishes credibility.

Option C: That the model be registered with the state

There is no general requirement that valuation models be registered with a state as a condition of an appraiser using their output. Some jurisdictions regulate appraisal management and model use in particular lending contexts, and those requirements vary and are not uniform nationally, so a registration answer cannot be the general rule. The appraiser's obligation to establish credibility exists regardless of any registry.

Option D: That the client select the model to be used

Letting the client choose the model would hand a party with an interest in the outcome control over an analytical input, which is the opposite of independence. A client may specify assignment conditions and scope of work expectations, but the appraiser determines the scope necessary for credible results and remains responsible for the analysis. Client selection of a tool does not transfer responsibility for its output.