Give differences : $\rm {ZIFT}$ method and $\rm {GIFT}$ method

$A$ : Inability to conceive or produce children even after $2\; years$ of unprotected sexual cohabitation is called infertility.
$R$ : Infertility is synonym for sterility

Difference between $ZIFT$ and $IUT$ lies in the

Briefly explain $\rm {IVF}$ and $\rm {ET}$, What are the conditions in which these methods are advised ?

Primary infertile female is the person who;