Combine parallelogram vectors, an internal angle and a nearest point

With respect to origin O, A and C have position vectors $3\mathbf i+11\mathbf j+11\mathbf k$ and $2\mathbf i-\mathbf j+10\mathbf k$, respectively. B is such that OABC is a parallelogram.

(i) Write down the position vector of B.

(ii) Find angle OAB to the nearest degree.

(iii) Find a vector equation of line AB.

D has position vector $-\mathbf i+13\mathbf j-9\mathbf k$.

(iv) Verify that D is on line AB.

(v) Find the position vector of the point on line AB closest to O.