A straight line through the vertex P of a triangle PQR intersects the side QR at the point S and the circumcircle of the triangle PQR at the point T. If S is not the centre of the circumcircle then
(a) \(\frac 1{PS} + \frac 1{ST} < \frac 2{\sqrt{QSSR}}\)
(b) \(\frac 1{PS} + \frac 1{ST} > \frac 2{\sqrt{QSSR}}\)
(c) \(\frac 1{PS}+ \frac 1{ST} < \frac 4{QR}\)
(d) \(\frac 1{PS}+ \frac 1{ST} > \frac 4{QR}\)