Which of the following is an example of a Physical Control?

Physical controls refer to security measures that are designed to prevent unauthorized access to physical locations, hardware, or resources. The example of implementing USB restrictions through Group Policy Objects (GPO) qualifies as a physical control because it restricts the physical use of USB ports on devices. This control aims to prevent potential data leakage or the introduction of malware by regulating what can be physically connected to the system.

In contrast, the other options focus on logical or administrative controls rather than physical ones. Two-factor authentication enhances security through a digital layer, strong passwords strengthen account protection, and encrypting data safeguards information at rest or in transit—none of which directly address the physical aspects of securing hardware or devices. Therefore, implementing USB restrictions through GPO specifically targets the physical security of the endpoints themselves, making it the appropriate choice for an example of a physical control.