OSPF is implemented over a pseudowire Layer2 VPN Which statement about this design implementation is true?

You are tasked with implementing a 1000-phone remote access solution, where phone calls will traverse a
WAN edge router. Assuming all of the following features are supported in a hardware- assisted manner, which of the following will have the most negative impact

What is the way that an OSPF ABR uses to prevent summary route information from being readvertised from an area into the network core (Area 0)?

ACME Corporation is deploying a new HR application that requires the network infrastructure to monitor and react to certain conditions in the network. Which feature should be used to meet this design requirement?

Refer to the exhibit.

How would you redesign the network to improve availability of the routers 1A and 1B at the core site?