During passage through the large intestine, a trophozoite will often secrete a case around itself, forming a cyst. Cysts contain four haploid nuclei. When cysts "hatch" within a new host, two trophozoites are released. Thus, which of the following must happen within the cyst, prior to hatching? 1)meiosis 2)nuclear division 3)S phase 4)binary fission
A) 1 only B) 1 and 2 C) 2 and 3 D) 2 and 4 E) 2, 3, and 4