A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?（）

• A、Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command.
• B、Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command.
• C、Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them.
• D、Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.