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Comprehensive and Detailed Explanation:

The correct answer is A because although the patient presents outside the 4.5-hour window for intravenous alteplase, current clinical guidelines support mechanical endovascular thrombectomy (EVT) for eligible patients with large vessel occlusions up to 24 hours from last known normal, provided advanced neuroimaging (such as CT perfusion or MRI) demonstrates a favorable mismatch between a small ischemic core and a large salvageable penumbra. Option B is incorrect because the 4.5-hour intravenous alteplase window is absolute and age does not extend it. Option C is incorrect because modern guidelines extend mechanical thrombectomy windows up to 24 hours based on tissue clock criteria rather than just time clocks. Option D is incorrect because acute therapeutic anticoagulation is contraindicated in acute ischemic stroke due to high bleeding risks. SCRN nurses facilitate advanced imaging protocols to rescue patients in extended windows.