The curve $y=-4x^2$ is best represented by

At point $P$, the value of $\frac{\mathrm{d}y}{\mathrm{d}x}$ is

If the slope of the graph (as shown in the figure) at points $1$, $2$ and $3$ are $M_1$, $M_2$ and $M_3$, respectively, then

The magnitude of the slope of the graph is shown below.