Why should the engineer select either FlexVPN or DMVPN for this environment?

A network engineer needs to select a VPN type that provides the most stringent security, multiple security associations for the connections, and efficient VPN establishment with the least bandwidth consumption. Why should the engineer select either FlexVPN or DMVPN for this environment?
A. DMVPN because it uses multiple SAs and FlexVPN does not.
B. DMVPN because it supports IKEv2 and FlexVPN does not.
C. FlexVPN because it supports IKEv2 and DMVPN does not.
D. FlexVPN because it uses multiple SAs and DMVPN does not.

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