Refer to the exhibit.  What will happen when one more user is connected to interface FastEthernet  5/1？（）

• A、 The first address learned on the port will be removed from the secure address list and be  replaced with the new address.
• B、 All secure addresses will age out and be removed from the secure address list. This will cause  the security violation counter to increment.
• C、 The packets with the new source addresses will be dropped until a sufficient number of secure  MAC addresses are removed from the secure address list.
• D、 The interface will be placed into the error-disabled state immediately， and an SNMP trap  notification will be sent.