The Shaded Area in the Diagram Represents an Estimation $\int _ { a } ^ { b } f ( x )$

Multiple Choice

The shaded area in the diagram represents an estimation $\int _ { a } ^ { b } f ( x )$ dx using:

A) Simpson's rule with n =4
B) a Riemann Sum using right endpoints
C) the midpoint rule with n = 4
D) a Riemann Sum using left endpoints
E) the trapezoid rule with n = 4