Which of the following is true for any subspace WWW of Rn\mathbb{R}^nRn?
The intersection of WWW and W⊥W^\perpW⊥ is {0⃗}\{\vec{0}\}{0}.
The union of WWW and W⊥W^\perpW⊥ is Rn\mathbb{R}^nRn.
The dimension of WWW must be n/2n/2n/2.
WWW must be a line or a plane.