How does the graph of g(x)=x+4 compares with the graph of the parent function, f(x)=x?
a) the graph of g(x) is shifted 4 units up
b) the graph of g(x) is compresses horizontally by a factor of 4
c) the graph of g(x) is compresses vertically by a factor of 4
d) the graph of g(x) is shifted 4 units to the right