Which of the following are the MOST important factors for proactively determining system vulnerabilities?

Which of the following are the MOST important factors for proactively determining system vulnerabilities?
A . Subscribe to vendor mailing list to get notification of system vulnerabilities
B. Deploy Intrusion Detection System (IDS) and install anti-virus on systems
C. Configure firewall, perimeter router and Intrusion Prevention System (IPS)
D. Conduct security testing, vulnerability scanning, and penetration testing

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Answer: D