You are working for a large company. You are trying to find a measure that will provide controlled physical access to the building and record every employee who enters the building. Which of the following would be the BEST for you to implement?

Smartcards paired with electronic locks can be used to allow entrance into a building. The smartcard system can also store information about the user, and therefore the system can log who enters the building. A security guard with a sign-in sheet would function, but there are many ways to subvert a sign-in sheet, and a guard can be distracted or become inattentive. This makes smartcard access a better measure. Guards are also more expensive over time. A camera would record who enters but would not control access. A nonemployee could enter the building. An uncontrolled/supervised sign-in sheet would not be secure.