The Phase 3 of DITSCAP C&A is known as Validation. The goal of Phase 3 is to validate that the preceding work has produced an IS that operates in a specified computing environment. What are the process activities of this phase? Each correct answer represents a complete solution. Choose all that apply.

A. Perform certification evaluation of the integrated system
B. System development
C. Certification and accreditation decision
D. Develop recommendation to the DAA
E. Continue to review and refine the SSAA