Which of the following statements is/are correct about ZIFT and GIFT as methods of helping conception in cases of infertility?
(P) ZIFT can help where the female is unable to form a viable ovum.
(Q) ZIFT uses methods of in vitro fertilisation.
(R) GIFT involves the injection of one's own ovum into the body.
S) GIFT uses in vivo fertilisation method.

Options

A. only P
B. only P and R
C. only Q, R and S
D. all - P, Q, R and S