What is not a 

What is not a difference between VPN tunnel authentication and per-user authentication?（）

AVPN tunnel authentication is part of the IKE specification.
BVPN tunnel authentication does not control which end user can use the IPSec SA (VPN tunnel).
CUser authentication is used to control access for a specific user ID, and can be used with or without a VPN tunnel for network access authorization.
D802.1X with EAP-TLS (X.509 certificates) can be used to authenticate an IPSec tunnel.

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