An administrator is looking to apply a new service pack for an OS on several systems that run business critical applications for a large international finance corporation.  Which of the following should the administrator do FIRST？（）

A.Deploy the service pack to a single department within the corporation.

B.Upgrade the system with requirements for that service pack.

C.Deploy the service pack to a non-critical application server.

D.Submit a change control for the service pack deployment.