[问答题]
The diagram shows part of the gra
j8j8- mg* 8yg6l4:kl upisfrpwq2lh9ph of y=f ′(x).
:v + mot(ethm/ The x-intercepts are at points A and C. There is a minimum at point B and a
teo/(mh :+tvm maximum at point D.
1. 1. Write down the value of $f^{\prime}(x)$ at A .
2. Hence, show that A corresponds to a maximum on the graph of f .
2. Which of the points A, B, C, D corresponds to a minimum on the graph of f .
3. Which of the points A, B, C, D corresponds to a point of inflection of f . Justify your answer.