Let T be the part of the paraboloid surface z = (x + 1)² + y² -5 that lies between the cylinders x² + y² = 1 and x² + y² = 3. Assume Tis oriented with downward unit normal. Let F(x, y, z) = i + (z+eˣ) j + 2y(eˣ - 4)k be a magnetic field. (a) Determine whether or not F is a conservative vector field.