Which statement is true about finding the midpoint between two points located on a horizontal or vertical line?
A
When finding the midpoint between two points on a vertical line, keep the x -coordinate and find the average of the y -coordinates.B
When finding the midpoint between two points on a horizontal line, the x -coordinate is always 0 and the y -coordinates are averaged.C
When finding the midpoint between two points on a vertical line, keep the y -coordinate and find the average of the x -coordinates.D
When finding the midpoint between two points on a horizontal line, the y -coordinate is always zero and the x -coordinates are averaged.