Which technology and VPN component allows a VPN headend to dynamically learn post NAT IP addresses of remote routers at different sites?

A network engineer has been tasked with configuring SSL VPN to provide remote users with access to the corporate network. Traffic destined to the enterprise IP range should go through the tunnel, and all other traffic should go directly to the Internet. Which feature should be configured to achieve this?

Which command automatically initiates a smart tunnel when a user logs in to the WebVPN portal page?

Which parameter is initially used to elect the primary key server from a group of key servers?

Which two changes must be made in order to migrate from DMVPN Phase 2 to Phase 3 when EIGRP is configured? (Choose two.)