Ans: D
I is true. The graph of $y=a^x$ for $a < 1$ is
I is true. The graph of $y=a^x$ for $a < 1$ is
II is true. The graph of $y=b^x$ for $b > 1$ is
III is true. Since the graph of $y=a^x$ is the reflection image of the graph of $y=b^2$ with respect to the $y$-axis.
