A force $\vec { F } = ( 5 \hat { i } + 3 \hat { j } + 2 \hat { k } ) N$ is applied over a particle which displaces it from its origin to the point $\vec { r } = ( 2 \hat { i } - \hat { j } ) m$. The work done on the particle in joules is\\
(1) - 7\\
(2) + 7\\
(3) + 10\\
(4) + 13