Automated scanning with a traditional spider and AJAX spider is the correct answer because it utilizes ZAP’s capabilities to crawl static and dynamic web pages effectively, which can identify more vulnerabilities by covering both traditional web applications and those using AJAX. A spider alone might miss the dynamically generated pages, and a manual review, although critical, is not as broad-reaching and is significantly more time-consuming. A port scan, although useful for network assessments, is not specifically designed for web application vulnerabilities, which is the focus when using ZAP.