Final answer:
The best access control system is option B, which includes a mix of multifactor authentication and multiple physical security controls. This method utilizes various security layers combining what a user has, knows, and is, to ensure maximum protection.
Step-by-step explanation:
When considering access control systems, the best choice depends on the specific security needs of the facility or organization. However, option B, which suggests a mix of multifactor authentication and multiple physical security controls, is generally recognized as the most robust and secure approach. This method combines something the user has (like an RFID card or key fob), something the user knows (like a password or PIN), and something the user is (such as a fingerprint or other biometric identifier). Multiple physical controls may include security guards, turnstiles, mantraps, or other barriers.
While RFID cards (option A) and key fobs (option D) are common forms of access control, they rely on a single factor (something the user has) and can be lost or stolen. Using 2FA (two-factor authentication, option C) is better than a single factor, but still not as comprehensive as combining multifactor authentication with physical security controls.