What is [\table x,y,z][\table a,h,g;h,b,f;g,f,c] equal to ? [NDA II 2016]

Correct Answer is : [ax+hy+gzhx+by+fzgx+fy+cz]

[\table ax+hy+gz;hx+by+fz;gx+fy+cz]

[\table ax+hy+gz,hx+by+fz,gx+fy+cz]