A company needs to improve the use of the network resources that is used to deploy internet access service to customers on separate backbone and internet access network. Which two major design models

Carrying full Internet routes in every customer L3VPN (VRF) is highly resource-intensive (memory, CPU) and not scalable, hence it does not improve the use of network resources.

Internet routing through a global routing table on a PE router is a foundational element, but it is not a complete design model for integrating Internet access with L3VPNs to optimize resources.

This is a common and efficient design model where Internet access routes are isolated within a dedicated VPN (or VRF) on the ISP network. Customer L3VPNs can then be configured to peer with this Internet VRF to gain Internet connectivity.

Internet access through leaking of Internet routes from the global table into the L3VPN VRF is another valid and common design, but the specific choices provided lead to C and E as the best answers for 'major design models' addressing resource use.

This describes a method of implementing Internet access, where a PE router dedicates specific interfaces (physical or logical) to a VRF that holds the global Internet routing table segment. This allows for controlled and isolated Internet access provision to various L3VPNs.