What is the equation of a circle whose center is at (-2, 1) and radius is 2.2?
A) ( x + 2 )^2+ ( y − 1 )^2 = 2.2
B) ( x − 2 )^2 + ( y + 1 )^2 = 2.2
C) ( x + 2 )^2 + ( y − 1 )^2 = 4.84
D) ( x − 2 )^2 + ( y + 1 )^2 = 4.84