Correct Answer should be A:
GRE therefore can encapsulate multicast traffic, routing protocols (OSPF, EIGRP etc) packets, and other non-IP traffic inside a point-to-point tunnel
https://www.networkstraining.com/passing-non-ip-traffic-over-ipsec-vpn-using-gre-over-ipsec/#:~:text=GRE%20therefore%20can%20encapsulate%20multicast,not%20as%20secure%20as%20IPSEC.
Correct answer is GRE. IP-IP can tunnel only ip traffic as per learning portal.
upvoted 3 times
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