The function g(x) = x is transformed to obtain function h: h(x) = g(x) + 1.
Which statement describes how the graph of his different from the graph of g?

A.
The graph of his the graph of g horizontally shifted right 1 unit.

B.
The graph of h is the graph of g vertically shifted down 1 unit.

C.
The graph of his the graph of ghorizontally shifted left 1 unit.

D.
The graph of his the graph of g vertically shifted up 1 unit.