During the implement phase， systems acceptance testing provides which two of the following services for the customer（）

A.It installs， configures， and verifies monitoring tools and processes in accordance with the operations implementation.
B.It verifies that the Cisco Unified Communications solutions is ready for production.
C.It verifies that the Cisco Unified Communications solution meets their business and technical requirements.
D.It executes and verifies the migration plan by migrating network services from an existing state to a future state.
E.It provides automated tools for measuring system performance under load.