The graph of the function f(x)= x squared - 4x+6 is shown here. What is its axis of symmetry?A. x=0B. x=2C. x=6D. x=-2

From the graph,
we can see that the axis of symmetry is
x = 2
Analytically:
f(x) = (x-2)squared - 4 + 6
f(x) = (x-2)squared + 2
Hence the axis of symmetry is x = 2