The graph of the piecewise function is shown.
what is the range of f(x)?

a){ f(x)| –∞ < f(x) < ∞}
b){ f(x)| –∞ < f(x) ≤ 4}
c){ f(x)| 4 < f(x) < ∞}
d){ f(x)| 0 ≤ f(x) < ∞}