The correct answer is D - Implementation of multifactor authentication for all user accounts.
According to WGU Cybersecurity Architecture and Engineering (KFO1 / D488), multifactor authentication (MFA) strengthens identity verification by requiring multiple forms of credentials, significantly reducing the risk of identity theft.
Firewalls (A) and USB port controls (B) improve system security but do not directly prevent identity theft.
Vulnerability scanning and patch management (C) address software weaknesses but not user authentication.
Reference Extract from Study Guide:
"Multifactor authentication (MFA) enhances user account security by requiring multiple verification factors, making it significantly harder for attackers to commit identity theft."
- WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Identity and Access Management Best Practices