Final answer:
Refusing to obey a client's unlawful instruction is not grounds for disciplinary action and is required by law and professional standards. Other actions like negligence, fraud, and dishonesty can lead to license revocation or suspension.
Step-by-step explanation:
The action that is NOT grounds for disciplinary action, including revocation or suspension of a license, among the options provided, is failing to obey a client's unlawful instruction. Professional standards and legal requirements dictate that a licensee in any profession must adhere to the law. Therefore, refusing to participate in illegal activities at the instruction of a client is a moral and legal obligation. In contrast, actions like acting negligently or incompetently, procuring a license fraudulently, and engaging in conduct that is dishonest or demonstrates untrustworthiness are all grounds that could indeed warrant disciplinary actions, including the possible revocation or suspension of a professional license.