Four students are playing a game. In a box, there are four strips of paper with four expressions…

Four students are playing a game. In a box, there are four strips of paper with four expressions written on each one. The student who picks up the meaningless expression will be out of the game. • Swati picks up the expression $\vec{a} \cdot (\vec{b} \times \vec{c})$. • Imran picks up the expression $\vec{a} \times (\vec{b} \times \vec{c})$. • Aryan picks up the expression $(\vec{a} \cdot \vec{b}) \times (\vec{c} \cdot \vec{d})$. • Maria picks up the expression $(\vec{a} \times \vec{b}) \cdot (\vec{c} \times \vec{d})$. Who is out of the game?