Upgrading end-of-support operating systemsisone of the most effective ways to reduce the attack surface.
Unsupported OS versionsno longer receive security patches, making them prime targets for attackers.
Removing outdated softwareensures that known vulnerabilities cannot be exploited.
A (honeynet)is used for threat analysis, not reducing the attack surface.
B (Group Policy)helps enforce security policies butdoes not address outdated vulnerabilities.
C (High availability)focuses on uptime, not security risk reduction.
Reference:CompTIA Security+ SY0-701 Official Study Guide, Security Architecture domain.

Code signing uses digital signatures to verify software authenticity and integrity, ensuring the code has not been tampered with since it was signed by the developer. It helps detect if malware was introduced after delivery.
Static code analysis (B) inspects code for vulnerabilities during development but does not verify delivered binaries. Input validation (C) protects applications at runtime. Secure storage (A) protects stored data, unrelated to software delivery.
Code signing is an essential security control in Software Development Life Cycle and Supply Chain Security
#6:Chapter 7 CompTIA Security+ Study Guide#.

The misuse of personally identifiable information (PII) is often mitigated through employee training on privacy legislation and company compliance. Training on privacy legislation educates employees about legal requirements and consequences related to handling PII, such as GDPR or HIPAA. Company compliance training reinforces internal policies and procedures regarding data handling, acceptable use, and the repercussions of violations.
While social engineering and phishing training are important for security awareness, they address external threats rather than insider misuse of data. Risk management is a broader discipline focused on assessing and mitigating organizational risks but does not directly prevent employee misuse through training. Remote work training focuses on secure practices for working outside corporate environments, which is not the core issue here.
This approach aligns with Security Program Management and Oversight principles emphasizing compliance and privacy training to reduce insider threats#6:Chapter 16 CompTIA Security+ Study Guide#.