Authentication is a key security control that prevents unauthorized users from accessing a smart device’s data or applications. It ensures that only authorized individuals can use the device, reducing risks such as data breaches, identity theft, and cyberattacks.

(A) Anti-malware software.

Incorrect. Anti-malware software protects against malicious programs, but it does not control user access to a device.

(B) Authentication. ✅

Correct. Authentication mechanisms (such as passwords, biometrics, PINs, and two-factor authentication) prevent unauthorized access to a device’s data and applications.

IIA GTAG " Managing and Auditing IT Vulnerabilities " highlights authentication as a primary control for protecting smart devices.

(C) Spyware.

Incorrect. Spyware is a security threat, not a preventive control. It is a type of malicious software that steals data from a device.

(D) Rooting.

Incorrect. Rooting (on Android) or jailbreaking (on iOS) refers to modifying a device to remove security restrictions, which increases security risks rather than preventing unauthorized access.

IIA GTAG – " Managing and Auditing IT Vulnerabilities "

IIA Standard 2120 – Risk Management

NIST Cybersecurity Framework – Identity and Access Management

Analysis of Answer Choices:IIA References:Thus, the correct answer is B, as authentication is the most effective security control for preventing unauthorized access to smart devices.