In the "Visual Cliff" Task, Infants Are Placed on the "Shallow

In the "visual cliff" task, infants are placed on the "shallow" side of a table covered in clear glass, where the solid floor is immediately beneath the glass on one side, then drops sharply a few feet on the other. The mother stands beyond the "deep" side of the table, looking at the baby. Which of the following research questions was this task designed to address?

A) Do babies have an innate fear of heights, or does this develop at a certain age?
B) Are mothers are frightened by the sight of their baby on the deep side of the cliff?
C) At what age do babies respond to their mother's facial expression in deciding whether to cross to the deep side of the cliff?
D) At what age do babies realize that the "cliff" is not real, and they are in no danger?