Simplify (3n – 2m)2 = ?
A9n2 – 12mn – 4m2
B9n2 + 12mn + 4m2
C6n2 – 12mn – 4m2
D9n2 – 12mn + 4m2
A9n2 – 12mn – 4m2
B9n2 + 12mn + 4m2
C6n2 – 12mn – 4m2
D9n2 – 12mn + 4m2