Which of the following descriptions of the network expansion process in SSL VPN is incorrect?

Which of the following descriptions of the network expansion process in SSL VPN is incorrect?
A . The remote user’s local PC will automatically generate a virtual network card. The virtual gateway randomly selects an IP address from the address pool and assigns it to the remote user’s virtual network card.
B . The remote user sends a service request message to the server on the enterprise intranet, and the message reaches the virtual gateway through the SSL VPN tunnel.
C . In reliable transmission mode, SSL VPN uses SSL protocol to encapsulate messages and uses UDP protocol as the transmission protocol
D . After the network expansion function is triggered, an SSL VPN tunnel needs to be established between the remote user and the virtual gateway first.

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Answer: C