A 66-year-old man develops sudden right-sided weakness and dysarthria that resolve completely within 30 minutes. CT head is normal. According to Canadian Stroke Best Practices, what is the most appropriate immediate secondary prevention strategy?ANo treatment is needed because symptoms resolvedBStart acetylsalicylic acid 160 mg loading dose then 81 mg daily and urgent work-up for TIACStart warfarin immediately without further evaluationDDelay antiplatelet therapy until MRI confirms infarctionEStart high-dose corticosteroids to reduce cerebral oedemaCheck my answer