The following vectors are orthogonal

$u=(1,-1,2,0),v=(2,2,0,1),w=(2,0,1,-1)$

statement $-1$:u and v are orthogonal

statement $-2$: v and w are orthogonal

only statement $2$ is correct

both $1$ and $2$ are incorrect

only statement $1$ is correct

both $1$ and $2$ are correct