A 62-year-old woman from Mumbai is admitted with acute onset vertigo, ataxia, and right-sided facial numbness. MRI brain shows an acute infarct in the right lateral medulla. Subsequent vascular imaging reveals stenosis of the right vertebral artery (VA) just before it enters the skull. Which component of the Circle of Willis would be critical for collateral supply to the basilar artery territory if the right VA occlusion progresses?

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