The lines $\vec { r } = ( \hat { i } - \hat { j } ) + l ( 2 \hat { i } + \widehat { k } )$ and $\vec { r } = ( 2 \hat { i } - \hat { j } ) + m ( \hat { i } + \hat { j } - \widehat { k } )$
(1) Do not intersect for any values of $l$ and $m$\\
(2) Intersect for all values of $l$ and $m$\\
(3) Intersect when $l = 2$ and $m = \frac { 1 } { 2 }$\\
(4) Intersect when $l = 1$ and $m = 2$