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
![](https://solvingmaster.space/wp-content/uploads/2021/06/2020PaperII33_fig01-300x219.png)
II is true. The graph of $y=b^x$ for $b > 1$ is
![](https://solvingmaster.space/wp-content/uploads/2021/06/2020PaperII33_fig02-300x202.png)
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.