B. XY-plane
ExplanationStep 1: Identify coordinate plane. Step 2: If z=0, points lie in the xy-plane. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: coordinate plane पहचानें। Step 2: z=0 होने पर points xy-plane में होते हैं। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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