यदि `a_(r)=cos""(2rpi)/(9)+ i sin""(2rpi)/(9),r=1,2,3,.......,i=sqrt(-1)`, तो सारणिक `|(a_(1),a_(2),a_(3)),(a_(4),a_(5),a_(6)),(a_(7),a_(8),a_(9))|` बराबर है :

Options

A. `a_(1)a_(9)-a_(3)a_(7)`
B. `a_(2)a_(6)-a_(4)a_(8)`
C. `a_(9)`
D. `a_(5)`