Lactational amenorrhea is . . . . . . .

Find out the correct statement.
$I$. Pills prevent ovulation during use as a contraception technique.
$II$. Copper-$T$ prevents implantation.
$III$. Vasectomy produces semen containing no sperm.

In females,the oviducts are surgically cut or tied to prevent fertilization. This procedure is called:

$A$: Periodic abstinence is a natural method of contraception in which couples avoid or abstain from coitus from day $10$ to $17$ of the menstrual cycle,when ovulation is expected.
$R$: Day $10$ to day $17$ of the menstrual cycle is considered a safe period.

Which of the following conditions can help in avoiding fertilization?

Which of the following contraceptive methods involves a role of hormones?