A point has the coordinates (m, 0) and m ≠ 0.
 Which reflection of the point will produce an image located at (0, –m)?
 a.) a reflection of the point across the x-axis 
 b.) a reflection of the point across the y-axis 
 c.) a reflection of the point across the line y = x
 d.) a reflection of the point across the line y = –x