B. 3
ExplanationStep 1: Compare with x² = 4ay. Step 2: 4a = 12 so a = 3. Step 3: x² = 4ay is an upward opening parabola.
Step 1: x² = 4ay से compare करें। Step 2: 4a = 12 इसलिए a = 3। Step 3: x² = 4ay ऊपर की ओर खुलने वाला parabola होता है।
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