Which is proven through specialized testing. Which of the following techniques should be applied to confirm the high availability claimed by the company?

A cloud service company is proposing a solution to a major sporting venue. The solution offers 99.999% availability during special events, which is proven through specialized testing. Which of the following techniques should be applied to confirm the high availability claimed by the company? (Select TWO.)
A. Vulnerability testing
B. Penetration testing
C. Load testing
D. Failover testing
E. Integration testing