Refer to the exhibit. Which optional AAA or RADIUS configuration command is used to support 802.1x guest VLAN functionality?

A.
aaa authentication dot1x default group radius

B.
aaa authorization network default group radius

C.
aaa accounting dot1x default start-stop group radius

D.
aaa accounting system default start-stop group radius

E.
radius-server host 10.1.1.1 auth-port 1812 acct-port 1813