If potential (in volts) in a region is expressed as V(x, y, z) = 6 xy - y + 2yz, the electric field (in N/C) at point (1, 1, 0) is : (a) - (6 + 5j + 2k) (b)-(2 + 3) + k) (c) -(6 + 9j+ k) (d) - (3 + 5) + 3k)