The LAN-side of the Teleworker router is assigned private IP address space (RFC1918), and the VPN topology is IPSec-only (no GRE protocol). When is it required to configure NAT/pNAT on the Teleworker router?（）
- Awhen all access to the Internet is through the IPSec tunnel
- Bwhen there is direct Internet access via split-tunneling
- Cwhen there is no Internet access configured through the Teleworker router
- Dwhenever you have IOS-Firewall (CBAC) configured