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A general two-dimensional Bravis lattice...

A general two-dimensional Bravis lattice of net particulr symmetry, the net premitive vectros `a_(1),a_(2)` are shown from origin 'O'.

(O,P,Q are lattice points) then `overline(OP)` and `overline(OQ)` are

A

`a_(1)+a_(2),a_(1)-a_(2)`

B

`a_(1)+2a_(2),-a_(1)+a_(2)`

C

`a_(1)-a_(2),a_(2)+a_(1)`

D

`a_(1)+a_(2),-a_(1)+2a_(2)`

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