How does the graph of g(x)=4⌊x⌋ differ from the graph of f(x)=⌊x⌋?

multiplying by 4 shifts the graph of g(x)=4⌊x⌋ up 4 units.

multiplying by 4 shifts the graph of g(x)=4⌊x⌋ down 4 units.

multiplying by 4 shifts the graph of g(x)=4⌊x⌋ right 4 units.

multiplying by 4 stretches the graph of g(x)=4⌊x⌋ vertically by a factor of 4