Which two statements are true about CAC？（）

• A、CAC is implemented in the call setup phase to allocate bandwidth resources
• B、CAC is implemented in the call maintenance phase to allocate bandwidth resources
• C、CAC is utilized during the call teardown phase to ensure that all resources have been released
• D、CAC uses the Cisco RSVP （Resource Reservation Protocol） Agent to integrate call-processing capabilities with the underlying network infrastructure
• E、CAC is implemented in the call setup phase to determine the destination of the call