Three vectors `vec(a),vec(b)and vec(c )` satisfy the relation `vec(a).vec(b)=0` and `vec(a).vec(c )=0`. The vector `vec(a)` is parallel to

Options

A. `vec(b)`
B. `vec(c)`
C. `vec(b).vec(c )`
D. `vec(b)xxvec(c )`

Answer

D