Point P=left(20,21right)P = \\left(20, 21\\right)P=left(20,21right) is reflected over the xxx-axis. What are the coordinates of the image?
left(20,−21right)\\left(20, -21\\right)left(20,−21right)
left(−20,−21right)\\left(-20, -21\\right)left(−20,−21right)
left(21,20right)\\left(21, 20\\right)left(21,20right)
left(−20,21right)\\left(-20, 21\\right)left(−20,21right)