Which of the following methods of contraception has the maximum chances of failure?

Which of the following is the terminal method of contraception?

In vasectomy,initially,what is the first step performed?

In lactational amenorrhoea,there is no ovulation or menstruation during the period of intense lactation following parturition,due to high levels of prolactin,which:

$A$ birth control implant having six small,plastic cylinders and with an effective period of up to $5$ years is:

$IUDs$ are small objects made up of plastic or copper that are inserted in the uterine cavity. Which of the following statements are correct about $IUDs$?
$(a)$ $IUDs$ decrease phagocytosis of sperm within the uterus.
$(b)$ The released copper ions suppress the sperm motility.
$(c)$ $IUDs$ do not make the cervix hostile to the sperm.
$(d)$ $IUDs$ suppress the fertilization capacity of sperm.
$(e)$ The $IUDs$ require surgical intervention for their insertion in the uterine cavity.
Choose the most appropriate answer from the options given below: