मान लीजिए $f(x) = \mathop {\text{Lim}}\limits_{h \to 0} \frac{1}{h} \int\limits_x^{x + h} \frac{dt}{t + \sqrt{1 + t^2}}$,तो $\mathop {\text{Lim}}\limits_{x \to -\infty} x \cdot f(x)$ है
- A$0$ के बराबर
- B$\frac{1}{2}$ के बराबर
- C$1$ के बराबर
- Dअस्तित्वहीन
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