Answer:
Anaphase.
Explanation:
Two main process of cell division are mitosis and meiosis. The regulation of the cell cycle is maintained by the regulation of cyclins, cdks and important protein factors.
Securin and separase are important proteins that allow the transition of one phase of the cell cycle to the another phase. The securin helps in the separation of the chromosome and sister chromatid that occurs in anaphase. Hence, dephosphorylation must occur prior to anaphase.
Thus, the correct answer is option (2).
