Given the function f(x)=1/3x^3-5/2x²+2x+2, find the points where the tangent line has slope -4.

Which of the following options correctly identifies the points where the tangent line has a slope of -4?

A) (x1, y1)
B) (x2, y2)
C) (x3, y3)
D) (x4, y4)