The action of a vaginal diaphragm is

$A$: Saheli - the new oral contraceptive for the female contains a non-steroidal preparation.
$R$: It is a 'once a week' pill with very few side effects and high contraceptive value.

Which of the following methods of birth control is considered the most effective?

Describe the sterilization method with a diagram.

Which of the following have been found to be very effective as emergency contraceptives,as they could be used to avoid possible pregnancy due to rape or casual unprotected intercourse if administered within $72$ hours?
$A.$ Administration of progestogens
$B.$ Progestogen-estrogen combinations
$C.$ $IUDs$ inserted within $72$ hours of coitus

Which of the following is a correct statement?