Final answer:
The term 'Classified' is not an official level of security clearance; it is a general descriptor for sensitive information. The actual levels of security clearance are Top Secret, Secret, and Confidential.
Step-by-step explanation:
The option that is NOT an official level of security clearance granted by the United States Federal Government is Option 3: Classified. In the context of U.S. government security clearances, Classified is a general term used to denote information that requires protection, but it is not a specific level of clearance. The official levels of security clearance are Top Secret, Secret, and Confidential. Restricted used to be a level of classification, but it is no longer used as a designation for a security clearance level.