Let RS be the diameter of the circle x2+y2=1 , where S is the point (1,0) . Let P be a variable point (other than R and S ) on the circle and tangents to the circle at S and P meet at the point Q . The normal to the circle at P intersects a line drawn through Q parallel to RS at point E . Then the locus of E passes through the point(s)
a. (31,31)
b. (41,21)
c. (31,−31)
d. (41,−21)