How must the graph y=3x2+1 be transformed to obtain the graph of y=3x2−1? A Each point on the graph of y=3x2+1 must be translated 2 units left.

B Each point on the graph of y=3x2+1 must be translated 2 units up.

C Each point on the graph of y=3x2+1 must be translated 2 units down.

D Each point on the graph of y=3x2+1 must be translated 2 units right.