What will be the slope of function f(x) at x = a, if \(\mathop {\lim }\limits_{x \to a}\frac{\sqrt {af(x)} \ -\ \sqrt{ax}}{\sqrt x\ -\ \sqrt a}\ \ =\ 1\) where f(a) = a, considering a, x & f(x) > 0
1
1
2
-1
3
2
4
More than one of the above
5
None of the above