If a teleworker is required to access the branch office via a secure IPSEC VPN connection, which technology is recommended to provide the underlying transport?

If a teleworker is required to access the branch office via a secure IPSEC VPN connection, which technology is recommended to provide the underlying transport?
A . ISDN
B . Metro Ethernet
C . Frame Relay
D . ADSL
E . ATM

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Answer: D