For the hyperbola a2x2−b2y2=1, the normal at point P meets the transverse axis AA′ in G and the conjugate axis BB′ in g, and CF is perpendicular to the normal from the centre. Find the eccentricity of the hyperbola that is the locus of the midpoint of G and g.
(1) (e2−1)1
(2) (e2−1)e
(3) 2(e2−1)
(4) 2e