Which deployed VoWLAN client security option is recommended by Cisco?

A.
Layer 3 with Layer 3 Security set to None and Web Policy set to Authentication

B.
Layer 3 with Layer 3 Security set to None and Web Policy set to VPN Pass-Through

C.
Layer 3 with Layer 3 Security set to VPN Pass-Through

D.
Layer 2 with Layer 2 Security set to 802.1X