If $\omega$ is a complex cube root of unity, then $(x+1)(x+ \omega)(x-\omega-1)=$

Question

$$\begin {array} {1 1} (1)\;x^3-1 & \quad (2)\;x^3+1 \\ (3)\;x^3+2 & \quad (4)\;x^3-2 \end {array}$$