Which two dynamic routing protocols work over FlexVPN for failover redundancy? (Choose two.)

IGRP is a legacy Cisco proprietary protocol that has been removed from modern IOS versions and is not supported in current FlexVPN environments.

IS-IS is not supported for routing over FlexVPN tunnel interfaces because it requires direct Layer 2 adjacency formation, which virtual tunnel interfaces do not provide.

RIP is not listed as a supported dynamic routing protocol for FlexVPN failover redundancy in Cisco's FlexVPN implementation guidance.

OSPF forms neighbor relationships over FlexVPN virtual tunnel interfaces, detecting path failures through dead-interval expiry and reconverging routes to provide failover redundancy in FlexVPN deployments.

EIGRP forms adjacencies over FlexVPN virtual tunnel interfaces and supports fast convergence using DUAL, making it a supported and practical choice for failover redundancy in Cisco FlexVPN designs.