The minimum value of the algebraic formula √ x + √ X-1 + √ X-2 is () a.0 B.1 + √ 2 C1 D does not exist

The minimum value of the algebraic formula √ x + √ X-1 + √ X-2 is () a.0 B.1 + √ 2 C1 D does not exist

When x = 2, the minimum value is 1 + √ 2
So choose B