What are two benefits of installing hardware fail-to-wire port pairs on Instant-On Network (ION) devices? (Choose two.)

What are two benefits of installing hardware fail-to-wire port pairs on Instant-On Network (ION) devices? (Choose two.)
A . local area network (LAN) Dynamic Host Configuration Protocol (DHCP) and DHCP relay
functionality
B. control mode insertion without modification of existing network configuration
C. network controller communication and monitoring
D. ensures automatic failover when ION devices experience software or network related failure

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Answer: D