What are three common reasons for ATM CRC errors？（）

• A、Incorrect VPI and VCI configuration
• B、Noise， gain hits， or other transmission problems on the data link equipment
• C、ATM cells are dropped due to incorrect ATM routing in the service provider.
• D、A faulty or failing ATM interface.
• E、Cells are dropped due to traffic policing in the ATM cloud on one or more virtual circuits attached to theATM interface