Which of the following is the MOST effective control over visitor access to a data center?
Visitors are escorted.
Visitor badges are required.
Visitors sign in.
Visitors are spot-checked by operators.
Escorting visitors will provide the best assurance that visitors have permission to access the data
processing facility. Choices B and C are not reliable controls. Choice D is incorrect because visitors
should be accompanied at all times while they are on the premises, not only when they are in the
data processing facility.