Which one of the following is a Physical Security Device?

A physical security device is a tangible object used to control, monitor, or grant access to a physical location or asset. A contactless smart card is a physical credential that contains an embedded integrated circuit. It is used with a physical card reader to electronically authenticate an individual and grant them access to a secured area, such as a data center building or server room. Its primary function is to enforce physical access control policies, making it a direct example of a physical security device.

A. Access Key: This term is ambiguous and more commonly refers to a logical credential, such as a cryptographic or API key, used for accessing data or software systems.
C. Token card: This device typically generates a one-time password (OTP) for authenticating a user for logical access to a network or application, not for physical entry.
D. Fiber optic cable: This is a component of the network infrastructure that requires protection; it is not a device used to implement physical security controls.

1. National Institute of Standards and Technology (NIST). (2018). Special Publication 800-116 Revision 1: Guidelines for the Use of PIV Credentials in Facility Access.

Section 2.1, "Purpose and Scope," explicitly discusses the use of credentials, such as smart cards, within Physical Access Control Systems (PACS) to manage and control entry to facilities. This document establishes the smart card as a key component in modern physical security. (DOI: https://doi.org/10.6028/NIST.SP.800-116r1)

2. Stallings, W., & Brown, L. (2018). Computer Security: Principles and Practice (4th ed.). Pearson.

Chapter 16, "Physical and Infrastructure Security," Section 16.3, "Physical Security Prevention and Mitigation Measures," describes various physical access control methods. It details the use of electronic access control systems that employ authentication devices like smart cards to control entry through doors and other barriers.

3. University of Illinois. (2021). IT Pro Forum: Cybersecurity - Physical Security.

In courseware and security standards documentation, physical access controls are defined. The section on "Access Control" specifies the use of electronic systems, including "card readers (proximity, smart card)" as a primary mechanism for securing sensitive areas like data centers. This material categorizes smart cards as a fundamental physical security tool.