The vectors $\overrightarrow{A}$ and $\overrightarrow{B}$ are such that $[\overrightarrow{A}+\overrightarrow{B}]=[\overrightarrow{A}-\overrightarrow{B}]$ .The angle between the two vectors is:-

Question

( A ) 90º
( B ) 45º
( C ) 60º
( D ) 75º