The following function is negative on the given interval.
\[
f(x)=-4-x^{2} ;[3,7]
\]
a. Sketch the function on the given interval.
b. Approximate the net area bounded by the graph of \( f \) and the \( x \)-axis on the interval using a left, right, and midpoint Riemann sum with \( n=4 \).
a. Choose the correct graph.
A.
B.
c.
D.