A 15-year old boy presents with weakness in both lower limbs that has progressed to involve the trunk over the last 6 days. Examination shows reduced power in muscles of the lower limbs, abdomen and chest; deep tendon reflexes are absent. CSF examination shows no cells, sugar-80 mg/dl and protein 80 mg/dl. The treatment of choice is:
I/V methylprednisolone I/V immunoglobulin I/V anti-thymocyte globulin Oral cycIosporin and prednisolone