What effect does changing the function f(x)=1/2 sin(x)+2 to the function g(x)= 2 sin(x)+8 have on the graph of f(x)? the graph is vertically stretched by a factor of 4 and shifted up 6 units. the graph is horizontally stretched by a factor of 6 and shifted up 4 units. the graph is vertically stretched by a factor of 6 and shifted up 4 units. the graph is horizontally stretched by a factor of 4 and shifted up 6 units.