A 63-year-old man presents with slurred speech and right arm weakness that began 90 minutes ago. CT head shows no hemorrhage. He meets all inclusion criteria and no exclusions for thrombolysis. What is the next best step?AAdminister IV alteplase within the 4.5-hour windowBDefer thrombolysis and start dual antiplatelet therapyCAdminister tenecteplase at thrombolytic dose is standard of careDWait for MRI confirmationEStart heparin infusion immediatelyCheck my answer