Which of these describe how a chromosomal mutation may occur during meiosis? (SELECT ALL THAT APPLY.)

A) Homologous chromosomes separate from each other during meiosis I.

B) Sister chromatids are pulled apart into four separate chromatids during meiosis II.

C) Two homologous chromosomes do not separate properly during meiosis I.

D) Sister chromatids fail to separate during meiosis II.