What accurately describes the comparison between stacking and VLT?

What accurately describes the comparison between stacking and VLT?
A . VLT allows for more physical devices to appear as one virtual device than stacking does.
B . Stacked switches share a common control plane while VLT peers maintain their own control plane
C . Stacked switches and VLT peers allow “single pane of glass” management by maintaining a single control plane.
D . Both VLT and stacking allow devices to use different versions of firmware provided that the switch family/series is the same.

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Answer: B