The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.

1) Spermatogonia have 46 chromosomes but always undergo mitotic division not meiotic division.

2) Primary spermatocytes divide by meiotic division not mitotic division.

3) Secondary spermatocytes have 23 chromosomes and undergo second meiotic division.

4) Spermatids are transformed into Spermatozoa.