Identify the points at which f(x) is differentiable. f(x) = |x + 3|; (-6, 3)
A.
f(x) is differentiable at x = 3.
B.
f(x) is differentiable at x = -3.
C.
f(x) is differentiable everywhere except at x = 3.
D.
f(x) is differentiable everywhere except at x = - 3.