Mark the correct A. monotonic function

B. constant function

C. identity function

D. not necessarily monotonic function

Formula:- (i) The necessary and sufficient condition for differentiable function defined on (a,b) to be strictly increasing on (a, b) is that f’(x)>0 for all x(a,b)

If f(x) is strictly increasing function on interval [a, b], then f^-1 exist and it is also a strictly increasing function