D. 1
ExplanationStep 1: Identify unit vector. Step 2: A unit vector is defined as having magnitude 1. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: unit vector पहचानें। Step 2: unit vector की definition ही magnitude 1 है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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