How does the graph of g(x)=2⌈x⌉ differ from the graph of f(x)=⌈x⌉?
A. Multiplying by 2 compresses the graph of g(x)=2⌈x⌉ vertically by a factor of 2.
B. Multiplying by 2 stretches the graph of g(x)=2⌈x⌉ vertically by a factor of 2.
C. Multiplying by 2 shifts the graph of g(x)=2⌈x⌉ up 2 units.
D. Multiplying by 2 shifts the graph of g(x)=2⌈x⌉ down 2 units.
