An Organization Will Be Extending Its Existing On-Premises Infrastructure into the Cloud

An organization will be extending its existing on-premises infrastructure into the cloud. The design consists of a transit VPC that contains stateful firewalls that will be deployed in a highly available configuration across two Availability Zones for automatic failover. What MUST be configured for this design to work? (Select two.)

A) A different Autonomous System Number (ASN) for each firewall.
B) Border Gateway Protocol (BGP) routing
C) Autonomous system (AS) path prepending
D) Static routing
E) Equal-cost multi-path routing (ECMP)