Which statement about dizygotic twins is correct?

1. Dizygotic twins form when two oocytes are released and each is fertilized by a separate sperm. 2. So forming from a single egg, as in A, is wrong. 3. Two zygotes form two embryos that implant separately. 4. Such twins are genetically different, so being exactly identical, as in C, is wrong. 5. Being genetically different, they may be the same or different gender, so always same gender, as in B, is wrong. 6. Only forming from two separately fertilized eggs, as in D, is correct. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 3 "Life Processes in Living Organisms Part 2", p.42_