Which technique from the options utilizes an in-vivo approach for the desired outcome?
ZIFT
GIFT
ICSI
IUT
GIFT (Gamete Intrafallopian Transfer) is a technique that utilizes an in-vivo approach. In GIFT, both the sperm and egg are collected and transferred directly into the fallopian tubes. This allows fertilization to occur naturally within the woman's body. It is an in-vivo procedure because the fertilization takes place inside the fallopian tubes, within the woman's reproductive system. Hence, the correct answer is option 2.