The normal at a variable point P on the ellipse (x²)/(a²) + (y²)/(b²) = 1 of eccentricity e' meets the axes of the ellipse at Q and R, then the locus of the midpoint of QR is a conic with an eccentricity e' such that
a. e' is independent of e
b. e' = 1
c. e' = e
d. e' = 1/e