Which of the following statements regarding BFD are correct? (Select 2 choices.)

A. BFD is supported by OSPF, EIGRP, BGP, and IS-IS.

B. BFD detects link failures in less than one second.

C. BFD can bypass a failed peer without relying on a routing protocol.
D. BFD creates one session per routing protocol per interface.
E. BFD is supported only on physical interfaces.
F. BFD consumes more CPU resources than routing protocol timers do.

Explanation:

Bidirectional Forwarding Detection (BFD) detects link failures in less than one second and is supported by Open Shortest Path First (OSPF), Enhanced Interior Gateway Routing Protocol(EIGRP), Border Gateway Protocol (BGP), and Intermediate SystemtoIntermediate System (ISIS). BFD is a detection protocol that is designed to detect forwarding path failures at a consistent rate, thereby providing network administrators with predictable reconvergence times. Additionally, BFD is designed to work regardless of media type, encapsulation, or routing protocol, providing network administrators with a uniform forwarding failure detection method across a network.
The detection of a forwarding path failure causes BFD to notify the routing protocol that a link has failed, which causes the routing protocol to recalculate the routing table. BFD works by sending control packets between two adjacent routers to create BFD neighbor sessions? BFD must be enabled on both routers. Once the neighbor relationship is established, the two adjacent routers send control packets to each other to maintain the neighbor relationship, similarly to how routing protocols maintain neighbor relationships. However, BFD sends packets at a much faster rate than routing protocols do.
BFD creates one session per address family per interface regardless of how many routing protocols are running on the interface. Therefore, if OSPF, EIGRP, BGP, and ISIS are running on an interface, only one BFD session will be created for that interface. However, if IPv4 and IPv6 are both used on an interface, two BFD sessions will be created. Physical interfaces, subinterfaces, virtual LAN (VLAN) interfaces, and port channels are supported by BFD.
BFD cannot bypass a failed peer without relying on a routing protocol. BFD is only responsible for detecting forwarding failures? it must use a routing protocol to bypass failures when they are detected.
BFD does not consume more CPU resources than routing protocol timers do. Unlike routing protocol timers, which reside entirely on the control plane, BFD can distribute some functions to the data plane, thereby reducing the CPU resources required by BFD.

Reference:
https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1053332
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/interfaces/configuration/guide/if_cli/if_bfd.html