Which technology is used to send multicast traffic over a site-to-site VPN?

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Which technology is used to send multicast traffic over a site-to-site VPN?
A . GRE over IPsec on IOS router
B . GRE over IPsec on FTD
C . IPsec tunnel on FTD
D . GRE tunnel on ASA

Answer: A

Explanation:

https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/216276-configure-route-based-site-to-site-vpn-t.html#anc6