If a circle has a center at (-3, 6) and a radius of √30 units, what is the equation of the circle?
Oa. (+3)² + (y- 6)² = √30
Ob. (z + 3)²+(-6)² = 30
Oc. (2-3)² + (y + 6)² = 30
Od. (2-3)²+(y+6)² = √30