In which phase of mitosis do the centromeres split so that sister chromatids separate and move to opposite poles?

1. In anaphase the centromeres split. 2. The separated sister chromatids, now called daughter chromosomes, are pulled to opposite poles by spindle fibers. 3. In metaphase the chromosomes are still aligned and centromeres are intact, so it is ruled out. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 2 "Life Processes in Living Organisms Part 1", p.27_