If

    \[\theta \]

is the angle between any two vectors

    \[\overrightarrow{a}\]

and

    \[\overrightarrow{b}\]

, then

    \[\left| \overrightarrow{a}.\overrightarrow{b} \right|=\left| \overrightarrow{a}\times \overrightarrow{b} \right|\]

when

    \[\theta \]

is equal to (A)

    \[0\]

(B)

    \[\frac{\pi }{4}\]

(C)

    \[\frac{\pi }{2}\]

(D)

    \[\pi \]