Answer:
D. It is not a function.
Step-by-step explanation:
Radius of given circle = 4 units
Center = (0,0)
Equation of circle :
where (h,k) is the center
So, equation of given circle =
Substitute x = -1
So, since at one value of x we are getting the two values of y .
A function is a relation that for each input, there is only one output.
So, It is not a function.
Hence Option D is true.