Which two statements about SAN port channels configured on Cisco Nexus 5000 Series switches are true？ （）  

• A、 The bring up protocol automatically detects and overrides any misconfiguration.
• B、 You can manually configure channel groups， or they can be automatically created.
• C、 Changes in configuration to the SAN port channel interface must also be made to all members of the channel group.
• D、 The port channel protocol uses the exchange fabric parameters command to communicate across peer ports in an ISL.
• E、 The port channel protocol ensures that a set of ports is eligible to be part of the same SAN port channel.