D. 4
ExplanationStep 1: Identify linear derivative. Step 2: The derivative of ax+b is a so it is 4. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: linear derivative पहचानें। Step 2: linear function ax+b का derivative a होता है इसलिए 4 है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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