78. The function f has the property that lim f(x) = +0. lim f(x) = -0, lim f(x) = 2, and lim f(x) = 2. Of the following, which could be the graph of f? (A) (B) -5 O 5 -5 -5- (0) (D) -5 O -5 -5- -5