Which of the following security clearances is not used by the government?

The clearance level referred to as "Restricted" is not typically considered a standard government security clearance category in the same way that Top Secret, Secret, and Confidential are. In government and military contexts, these three clearances correspond to specific classifications of information:

• Top Secret pertains to information that could cause exceptionally grave damage to national security if disclosed.

• Secret relates to information that could cause serious damage to national security if released.

• Confidential refers to information that could cause damage to national security but to a lesser extent than the previous two levels.

While "Restricted" may exist in certain organizations or contexts, it does not align with the widely recognized security classification system used by the government. Therefore, identifying "Restricted" as the clearance not used by the government is accurate. It is important to understand these classifications as they help determine access to sensitive information and the protocols needed to safeguard such information.