Regarding the NAC statement, which is wrong in the following description?

Regarding the NAC statement, which is wrong in the following description?
A . NAC (Network Admission Control) is called Network Admission Control
B . NAC is an end-to-end security structure, including 802.1x, MAC and Portal authentication
C . NAC access terminal equipment, if Portal authentication is used, client software needs to be installed
D . NAC’s access terminal adopts 802.1x authentication, you need to install client software

Answer: C