Final answer:
The most severe sanction a board can issue is license revocation, which is a formal negative sanction representing the permanent removal of professional credentials.
Step-by-step explanation:
The most severe sanction a board can give is license revocation. In the context of formal negative sanctions, which are used to officially recognize and enforce norm violations, the options can be seen on a scale of severity. A written warning is less severe and often serves as an initial measure to correct behavior.
A license suspension is more severe than a warning and involves a temporary removal of one's professional privileges. A fine is a monetary penalty but does not necessarily stop someone from practicing their profession. However, license revocation is considered the most drastic and severe form of disciplinary action, as it permanently removes a person's professional credentials and their ability to practice within their field.
This is reflective of serious violations and is equivalent to measures such as expulsion from an academic institution or being fired from a professional post.