For any given function f(x), if g(x)=f(x+k) and k>0 which of the following statements is true a. g(x) is shifted vertically k units below f(x)
b. g(x) is shifted vertically k units above f(x)
c. g(x) is shifted horizontally k units to the right of f(x)
d. g(x) is shifted horizontally k units to the left of f(x)