$[\overrightarrow{a b c}]$ is a scalar triple product of three vectros $\vec{a}, \vec{b}$ and $\vec{c}$ then $[\overrightarrow{a b c}]$ is equal to
(a) $[\vec{c} \vec{b} a]$
(b) $[\overrightarrow{c a b}]$
(c) $[\overrightarrow{a c b}]$
(d) $[\vec{b} \overrightarrow{a c}]$