Which of the following is an ideal contraceptive for females who want to delay pregnancy and space out children?

Identify the natural methods of contraception from the following list:
$I$. Implantation
$II$. Lactational amenorrhoea
$III$. Condoms
$IV$. Vasectomy
$V$. Tubectomy
$VI$. Sterilisation

The hormone-releasing Intra Uterine Device $(IUD)$ is . . . . . . .

How do injectable contraceptives ($DMPA$ - Depot Medroxyprogesterone Acetate) prevent ovulation?

Which of the following is a once-a-week pill with very few side effects and high contraceptive value?

Out of the following options,identify which one is $NOT$ a natural method of contraception.