A 60-year-old man presents with complaint of inability to swallow and hoarseness of his voice for the last two hours. His wife tells you about multiple episodes of vomiting and dizziness her husband experienced while moving about the house.His vitals are stable. On clinical examination, you find that he has an ataxic gait towards the left along with miosis and ptosis on the same side. A detailed CNS examination reveals decreased pain, temperature sensations on the right side of his body coupled with a right-sided detion of his uvula. Which of the following aeries has most likely been occluded?