Find the Magnitude of the Vector Described Below $( 5,6 , - 4 )$

Multiple Choice

Find the magnitude of the vector described below.
Initial point: $( 5,6 , - 4 )$
Terminal point: $( - 4,2,7 )$

A) 2
B) 36
C) $2 \sqrt { 6 }$
D) $2 \sqrt { 218 }$
E) $\sqrt { 218 }$