When you enable port security on an interface that is also configured with a voice VLAN，  what is the maximum number of secure MAC addresses that should be set on the port？（）

• A、No more than one secure MAC address should be set.
• B、The default will be set.
• C、The IP phone should use a dedicated port， therefore only one MAC address is needed per port.
• D、No value is needed if the switchport priority extend command is configured. 
• E、No more than two secure MAC addresses should be set.