Refer to the exhibit. An attacker is connected to interface Fa0/11 on switch A-SW2 and attempts to  establish a DHCP server for a man-in-middle attack.  Which recommendation， if followed， would  mitigate this type of attack？（）

• A、 All switch ports in the Building Access block should be configured as DHCP untrusted ports.  
• B、 All switch ports in the Building Access block should be configured as DHCP trusted ports.
• C、 All switch ports connecting to servers in the Server Farm block should be configured as DHCP  untrusted ports.
• D、 All switch ports connecting to hosts in the Building Access block should be configured as DHCP  trusted ports.
• E、 All switch ports in the Server Farm block should be configured as DHCP untrusted ports.
• F、 All switch ports connecting to hosts in the Building Access block should be configured as DHCP  untrusted ports.