Final answer:
Revocation is the action that permanently prohibits a sanctioned individual from practicing their profession, meaning the professional license is canceled indefinitely, and the individual is barred from their practice.
Step-by-step explanation:
The action that permanently prohibits the sanctioned individual from practicing the profession is b) Revocation. Revocation refers to the complete withdrawal of the right to practice one's profession after serious misconduct or repeated lesser offenses.
This action is taken by the licensing body or the regulatory authority and means that the professional license is canceled, and the individual is barred from practicing the profession indefinitely unless the license is reinstated through a legal or regulatory process, which is often difficult and not guaranteed.
In contrast, a suspension is temporary, probation typically involves oversight or conditions placed on the individual's practice, and a warning is just a notice of misconduct without any immediate restriction on practice.