Find the critical point(s) of the function. (Select all that apply. The variablesa, b, c, d, e, and fare real numbers.) + f(x, y, z) = 8 − [x(y − 7)(z + 4)] - 2 ≤8 (0, a, b) (-2, f, e) (c, 7, d) (c, b, 1) (e, f,-4) (8, a, b) x ☑