Which of the following controls could an internal auditor reasonably conclude is effective by observing the physical controls of a large server room?

Which of the following controls could an internal auditor reasonably conclude is effective by observing the physical controls of a large server room?
A . Adequate signs are in place to assist in locating safety equipment.
B . Servers are secured individually to their racks by locks.
C . Foam fire extinguishers are operable to protect against electrical fires.
D . Swipe card access is required to gain access to the server room.

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Answer: A