Find the center of the circle whose equation is x² + y² = 4. a.(0, 0) b.(1, 1) c.(2, 2) the answer is not b or c can someone explain to me how to solve the problem and get a

We know that

the general equation of a circle is
(x-h)²+(y-k)²=r²
where 
(h,k)> is the center of a circle
r> is the radius

we have
x²+y²=4> x²+y²=2²> (x-0)²+(y-0)²=2²
then
the center (h,k) is > (0,0)
and radius r=2 units

the answer is the option A.(0, 0)

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