Find a single expression that represents the area of the outer ring of the circle if the area of the whole circle is represented by the expression "25x2 − 12x − 9."
A) 18x2 − 12x − 6
B) 18x2 − 12x − 12
C) 32x2 − 12x − 6
D) 32x2 − 12x − 12
