Which Layer 2 tunneling technology do you recommend?

A company would like to distribute a virtual machine (VM) hosting cluster between three data centers with the capability to move VMs between sites. The connectivity between data centers is IP only and the new design should use the existing WAN. Which Layer 2 tunneling technology do you recommend?
A. VPLS
B. L2TPv3
C. OTV
D. AToM

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