Find the Cosine of the Angle Between the Two Vectors $\langle 1,1,1 \rangle$

Multiple Choice

Find the cosine of the angle between the two vectors $\langle 1,1,1 \rangle$ and $\langle1,4,3 \rangle$ .

A) $8 / \sqrt { 41 }$
B) $8 / \sqrt { 53 }$
C) $8 / \sqrt { 69 }$
D) $8 / \sqrt { 78 }$
E) $4 / \sqrt { 41 }$
F) $4 / \sqrt { 53 }$
G) $4 / \sqrt { 69 }$
H) $4 / \sqrt { 78 }$