To determine which of the statements are true based on the graph of $f'$:

1. Relative Min at $x = -3$:

   • A relative minimum of $f$ occurs where $f'$ changes from negative to positive.
   • At $x = -3$, $f'$ is increasing (it changes from negative to positive).

2. Point of Inflection at $x = 2$:

   • A point of inflection of $f$ occurs where $f''$ (the second derivative) changes sign, which corresponds to $f'$ having a local extremum (either a max or min).
   • At $x = 2$, $f'$ has a local minimum, indicating that $f''$ changes sign, so there is a point of inflection at $x = 2$.

3. Concave Down for $0 < x < 4$:

   • $f$ is concave down where $f'' < 0$, which corresponds to $f'$ being decreasing.
   • For $0 < x < 4$, $f'$ is indeed decreasing, indicating $f$ is concave down in this interval.

Based on the above analysis, all three statements are true:

• I is true because $f$ has a relative minimum at $x = -3$.
• II is true because the graph of $f$ has a point of inflection at $x = 2$.
• III is true because the graph of $f$ is concave down for $0 < x < 4$.

Therefore, the correct answer is:

All three statements (I, II, and III) are true.

Would you like more details or have any questions?

Here are some questions you might ask next:

1. Can you explain how to identify points of inflection on a graph of $f'$?
2. How do you determine concavity from the graph of $f'$?
3. What are the key features to look for on the graph of a derivative?
4. Can you give an example of how to find relative extrema using the first derivative?
5. How does the behavior of $f'$ relate to the concavity of $f$?

Tip: When analyzing the graph of a derivative, remember that points where the derivative changes sign can indicate relative extrema of the original function.