This graph represents the path of a baseball hit during practice. What does the x-value of the vertex represent?

(A) the maximum height of the baseball
(B) the time the baseball was hit
(C) ground level
(D) the time the baseball reached its maximum height

This graph represents the path of a baseball hit during practice.
What does the y-value of the vertex represent?

(A) the maximum height of the baseball
(B) the time the baseball reached its maximum height=
(C) ground level
(D) the time the baseball was hit