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Comprehensive and Detailed Explanation:

The correct answer is A because rigorous blood pressure control is the single most important intervention for preventing recurrent stroke. Current guidelines recommend lowering blood pressure below 140/90 mmHg for all stroke survivors, with tighter targets (such as below 130/80 mmHg) recommended for patients with high-risk comorbidities like diabetes mellitus or lacunar strokes, provided treatment is well-tolerated. Option B is incorrect because stopping antihypertensive agents drastically increases the risk of recurrent ischemic and hemorrhagic events. Option C is incorrect because 142/86 mmHg is above the optimal target range and warrants optimization. Option D is incorrect because raising blood pressure with saline is contraindicated in secondary prevention and would worsen hypertension. SCRN nurses educate patients on the vital role of medication adherence, home blood pressure tracking, and salt restriction.