Using the image below, identify which of the statements is true.

a. in part a the cell is 2n, and in part b the cell is 4n.

b. all of the above are true.

c. part a in the image is the chromosome before s phase of interphase, and part b is after dna replication has occurred.

d. the image shows a homologous pair chromosome 4 in part a, and sister chromatids in part b.