Ina assisted reproductive technology where gametes have been fertilized invitro, which of the following is practicable for embryo transplantation in fallopian tube?
1. Only embryo (upto 8 blastomeres if zygote is not transplanted)
2. Only zygote is transplanted not embryo
3. Either embryo or zygote with 8 blastomere phase transplanted
4. Morulla with 8-24 celled stage is transplanted in fallopian tube