Which of the following statements by the preceptor best describes the process of cell differentiation?

A student nurse practitioner asks her preceptor about the origins of different tissues, and their cellular origins during the process of development. Which of the following statements by the preceptor best describes the process of cell differentiation?
“Cells of the hematopoietic system produce the appropriate body cells that are required at each stage of development.”
“A single stem cell differentiates into approximately 200 different types of cells.”
“A fertilized ovum undergoes a series of divisions, yielding many different cell types.”
“Cells differentiate into necessary body cells, peaking after conception, and ceasing near the time of birth.”