HCU MCA 2015 Paper

Consider the function f : R $\to$(0,∞)$$, f(x) = a${}^{\mathrm{x}}$ , where ‘a’ is a positive constant. The following statements are made about the graph of ‘f’ :
(i) It is parallel to X axis.
(ii) It is monotonically increasing in ‘x’.
(iii) It is monotonically decreasing in ‘x’.
Which of the following is true regarding these statements ?