I've got a good feeling about B. The question specifically asks about protecting only the backbone, and dual-homing seems like the most targeted approach for that.
Okay, let me think this through. Type B is for dual-homing, so that seems like the right direction. I'll focus on understanding the differences between single-homing and dual-homing to narrow it down.
Hmm, I'm not too sure about this one. I'll need to review the differences between the protection modes to determine which one only protects the backbone.
I'm not too familiar with these protection modes, but Type C dual-homing protection sounds like it could be the answer. Gotta love those dual-homing options!
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