For the smooth curve r(t), find the parametric equations for the line that is tangent to r at the given parameter value t = to. r(t) = (6+2 - 6t )i + (t + 3)j + k; to =2 O x - 18t, y = t, z = t x - 12 + t, y = t, z= t 4 O x - 12 + 18t, y - 5 + t, z = 1 O x - 12 + 18t, y = 5 + t, z -0