Location and scale are the same theta so the variance is 2 theta squared

Let $X_{1}, X_{2}, \dots, X_{n} (n \ge 2)$ be a random sample from a continuous distribution with the probability density function f(x|$\theta) =$ $(1/2\theta)e^{-|x-\theta|/\theta}$, $x \in \mathbb{R}$, where $\theta (> 0)$ is an unknown parameter. Let $U_{n} = (1/n)\sum_{i}$₌$_{1}^{n} X_{i}, V_{n} = (1/n)\sum_{i}$₌$_{1}^{n} X_{i}^{2}$, and $S_{n}^{2} = (1/(n-1))\sum_{i}$₌$_{1}^{n}(X_{i} - U_{n})^{2}$. Then, which of the following statements are true?