A client has overruled the technical advice of Jane, a professional member, on equipment purchase.

NPPE professional practice guidance emphasizes documenting advice, communicating risks clearly, and ensuring the client makes informed decisions—while the professional must not allow public safety or regulatory compliance to be compromised. When a client rejects professional recommendations for cost reasons, the professional should provide the rationale, risks, life-cycle implications, and any safety/code/regulatory consequences in writing. Obtaining written acknowledgment helps ensure clarity, reduces misunderstanding, and creates a record that the professional fulfilled the duty to warn. This aligns with option D. Option A is incorrect because the client paying does not override the professional’s obligations; if the alternative is unsafe or non-compliant, the professional must not endorse it and may need to withdraw. Option B may be appropriate later if the client insists on an unsafe/non-compliant choice, but resignation is not the best initial step before clear written warning and documentation. Option C is generally inappropriate as an initial action; clients are not typically reportable simply for choosing cheaper equipment unless it creates an imminent hazard or violates law requiring reporting. Therefore, D is the best course initially.