Final answer:
Locks and Key Cards are examples of physical access controls, ensuring restricted physical entry, unlike passwords or firewalls which are logical controls for computer security.
Step-by-step explanation:
An example of a physical access control from the options provided would be Locks and Key Cards. Physical access controls are measures taken to ensure that access to physical locations like buildings, rooms, or data centers is restricted and can only be accessed by authorized individuals. Locks on doors or safes and key card systems that grant access to secure areas are typical physical access control mechanisms. On the other hand, passwords and firewalls are forms of logical access control, which pertain to the protection of computer systems and networks.