Find the Magnitude of the Vector V Described Below $2 \sqrt { 3 }$

Multiple Choice

Find the magnitude of the vector v described below. Initial point: (3,-7,0)
Terminal point: (-1,1,0)

A) -4
B) 12
C) $2 \sqrt { 3 }$
D) $8 \sqrt { 5 }$
E) $4 \sqrt { 5 }$