Which best describes a minimum value of a polynomial?
A. A point on the graph of the polynomial that has a smaller x-value than any nearby points on the graph
B. A point on the graph of the polynomial that has a greater y-value than any nearby points on the graph
C. A point on the graph of the polynomial that has a greater x-value than any nearby points on the graph
D. A point on the graph of the polynomial that has a smaller y-value than any nearby points on the graph