Define r by r(x)=x2−4(x−2)(x+1). Which of the following correctly classifies the discontinuities of r?
a) Removable at x=2 and removable at x=−2
b) Infinite at x=2 and removable at x=−2
c) Removable at x=2 and infinite at x=−2
d) Infinite at both x=2 and x=−2