Explanation
OWASP (Open Web Application Security Project) is a non-profit organization that provides resources and guidance for improving the security of web applications. It can be the best resource for a software developer who is looking to improve secure coding practices for web applications by offering various tools, frameworks, standards, cheat sheets, testing guides, etc., that cover various aspects of web application security development and testing

The MITRE ATT&CK framework would best support the analyst's review of the tactics, techniques, and procedures (TTPs) the threat actor was observed using in previous campaigns. The MITRE ATT&CK framework is a knowledge base that describes the common TTPs used by various threat actors across different stages of an attack lifecycle. The framework can help security analysts understand how adversaries operate, what tools they use, what vulnerabilities they exploit, what indicators they leave behind, etc. The framework can also help security analysts improve their detection and response capabilities by providing recommendations and best practices.

Isolation involves removing affected components from any environment the greater one. This can be anything from removing the server from the network after become the target of DoS attacks, to the point of placing applications in a VM sandbox outside the environment where the host usually runs. Whatever the situation, you'll want to make sure you don't there is another Interface between the affected component and the production network or the Internet.

Explanation
The Common Vulnerability Scoring System (CVSS) is a free and open industry standard for assessing the severity of computer system security vulnerabilities. CVSS attempts to assign severity scores to vulnerabilities, allowing responders to prioritize responses and resources according to threat
https://en.wikipedia.org/wiki/Common_Vulnerability_Scoring_System