When attempting to tunnel FTP traffic through a stateful firewall that may be performing NAT or PAT, which type of VPN tunneling should be used to allow the VPN traffic through the stateful firewall?

When attempting to tunnel FTP traffic through a stateful firewall that may be performing NAT or PAT, which type of VPN tunneling should be used to allow the VPN traffic through the stateful firewall?
A . clientless SSL VPN
B . IPsec over TCP
C . Smart Tunnel
D . SSL VPN plug-ins

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Answer: B