The velocity' of a particle is $\mathbf{v}\mid =6\hat{\mathbf{i}}+2\hat{\mathbf{j}}-2\hat{\mathbf{k}}$. The component of the velocity parallel to vector $\mathbf{a}=\hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}}$  in vector form is

• A

  $6\hat{\mathbf{i}}+2\hat{\mathbf{j}}+2\hat{\mathbf{k}}$

• B

  $2\hat{\mathbf{i}}+2\hat{\mathbf{j}}+2\hat{\mathbf{k}}$

• C

  $\hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}}$

• D

  $6\hat{\mathbf{i}}+2\hat{\mathbf{j}}-2\hat{\mathbf{k}}$