(Single choice) The following statement about the PITP protocol is incorrect

The PITP protocol includes pitp P mode and PITP V mode

The purpose of the PITP feature is to provide the upper authentication server with the physical location information of the access user, and the BRAS device can realize the user account and the press position after obtaining the user access location information

Bind the authentication of the information to avoid the theft and roaming of the user account

In pitp V mode, the user's physical location information is added to the PPPOE message sent by the user side to cooperate with the upper-level server for user authentication

PITP P mode can also be called PPOE+ mode