Right option is (c) x = 3 is the global maximum
To explain: Clearly, x = 1, 3 are the points of global minimum (as the values being equal).
And, x = 0, 4 are the points of global maximum (as the values being equal).
And, x = 2, is the point of local maximum (as the values being equal).
Thus, x = 3 is the global maximum.