The birth control device used by women is
(a) What is the name of the surgical method of birth control in human males in which the sperm ducts are cut and ligated (tied) at both ends? (b) What is the name of the surgical method of birth control in human females in which the oviducts are cut and ligated (tied) at both ends? (c) Name the contraceptive device used by the human males which act as a sheath over the male organ and traps the sperms in it. (d) Name the contraceptive device used by human females which are put over the cervix.