Find the Dot Product Of $\mathbf { u }$ And $\mathbf { v }$

Multiple Choice

Find the dot product of $\mathbf { u }$ and $\mathbf { v }$ .
$$\mathbf { u } = 9 \mathbf { i } - 5 \mathbf { j } - 9 \mathbf { k } , \mathbf { v } = - 2 \mathbf { i } + 6 \mathbf { j } + 5 \mathbf { k }$$

A) $- 93$
B) 4
C) $- 18 \mathbf { i } - 30 \mathbf { j } - 45 \mathbf { k }$
D) $- 3$
E) $7 \mathbf { i } + \mathbf { j } - 4 \mathbf { k }$