The function f is given by f(x)=3+(1)/(5x) . Which of the following is a true statement regarding an equivalent expression for f(x) and its end behavior?
a. f is equivalent to (3x+1)/(5x) . As x approaches infinity, f approaches 5
b. f is equivalent to (15x+1)/(5x) . As x approaches infinity, f approaches 5
c. f is equivalent to (3x+1)/(5x) . As x approaches infinity, f approaches 3
d. f is equivalent to (3x+1)/(5x) . As x approaches infinity, f approaches 3