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.