正解:A
Explanation
Escalation processes are the most important security consideration when developing an incident response strategy with a cloud provider, as they define the roles, responsibilities, communication channels, and decision-making authority for both parties in the event of a security incident. Escalation processes help to ensure timely and effective response, coordination, and resolution of security incidents, as well as to avoid conflicts or confusion. (From CISM Review Manual 15th Edition) References: CISM Review Manual 15th Edition, page 184, section 4.3.3.2.