In MS-Excel what chart object is horizontal or vertical line that extends across the plot area to make it easier to read and follow the values?

In MS-Excel what chart object is horizontal or vertical line that exte

1.	In MS-Excel what chart object is horizontal or vertical line that extends across the plot area to make it easier to read and follow the values?
A.	Category axis
B.	Data marker
C.	Gridline
D.	Both (1) & (2)
Answer» E.