Your question is XSS Mitigation and OWASP SAMM. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe how you would approach XSS mitigation and how you would use OWASP SAMM to guide security maturity improvements at Systems Application & Technologies.