Let f be a function that is defined for all real numbers x. Of the following, which is the best interpretation of the statement lim x→2 f(x)=7?

a. The function f is undefined at x=2.
b. The function f approaches 7 as x approaches 2.
c. The function f is equal to 7 at x=2.
d. The function f oscillates between 2 and 7 as x approaches 2