For a, b ∈ Z and |a - b| ≤ 10, let the angle between the plane P : ax + y - z = b and the line l : x - 1 = a - y = z + 1 be cos-1(1/3). If the distance of the point (6, -6, 4) from the plane P is 3√6 , then a4 + b2 is equal to
(1) 85
(2) 48
(3) 25
(4) 32
