Refer to the exhibit. Which two statements are correct regarding these two Cisco ASA clientless SSL VPN bookmarks? (Choose two.)

A.
CSCO_WEBVPN_USERNAME is a user attribute.

B.
CSCO_WEBVPN_USERNAME is a Cisco predefined variable that is used for macro substitution.

C.
The CSCO_WEBVPN_USERNAME variable is enabled by using the Post SSO plug-in.

D.
CSCO_SSO is a Cisco predefined variable that is used for macro substitution.

E.
The CSCO_SSO=1 parameter enables SSO for the SSH plug-in.

F.
The CSCO_SSO variable is enabled by using the Post SSO plug-in.