Which of the following is true of meroblastic cleavage?

• A. All cell divisions are perpendicular to the animal-vegetal pole.
• B. The mesoderm and endoderm differentiate via cell division from mesenchyme.
• C. Newly formed cells migrate toward the interior of the embryo.
• D. The zygote and later blastomeres completely divide with each round of cell division.
• E. Cell division is restricted to a small disk of yolk-free cytoplasm at the animal pole of the zygote.