The L.C.M. of x2 - 2x - 3 and x3 + x2 + x + 1 is

• A. (x + 1)(x - 3)(x2 + 1)
• B. (x2 + 1)(x + 4)
• C. (x - 1)(x + 3)(x2 + 1)
• D. (x2 + 3)(x - 1)