Vector Algebra: JEE Main 2020 Mathematics question

Let the volume of a parallelopiped whose coterminous edges are given by $\overrightarrow u = \widehat i + \widehat j + \lambda \widehat k$, $\overrightarrow v = \widehat i + \widehat j + 3\widehat k$ and $\overrightarrow w = 2\widehat i + \widehat j + \widehat k$ be 1 cu. unit. If $\theta$ be the angle between the edges $\overrightarrow u$ and $\overrightarrow w$ , then cos$\theta$ can be :