Consider the integral \displaystyle \int_0^9\sqrt{\dfrac{x^2}{3}+1}\, dx. The lower and upper bounds of this integral are: Question 12Select one: 1 \leq \displaystyle \int_0^9\sqrt{\dfrac{x^2}{3}+1}\, dx \leq 2\sqrt{7} 9 \leq \displaystyle \int_0^9\sqrt{\dfrac{x^2}{3}+1}\,dx \leq 2\sqrt{7} 3 \leq \displaystyle \int_0^9\sqrt{\dfrac{x^2}{3}+1}\, dx \leq 2\sqrt{7} 9 \leq \displaystyle \int_0^9\sqrt{\dfrac{x^2}{3}+1}\, dx \leq 18\sqrt{7} 0 \leq \displaystyle \int_0^9\sqrt{\dfrac{x^2}{3}+1}\, dx \leq 9