Confidence intervals — a pivot from a triangular density

Let $X$ be a single sample from an absolutely continuous distribution with probability density function

$$f(x\mid\theta)=\begin{cases}\dfrac{2}{\theta^2}(\theta-x), & 0<x<\theta\\ 0,&\text{otherwise,}\end{cases}$$

where $\theta>0$ is unknown. Which of the following intervals is a 95% confidence interval for $\theta$?