ABCD rectangle, DEFG square\
$| \mathrm { DE } | = 6$ units\
$| \mathrm { AE } | = 3$ units\
$| \mathrm { AB } | = 12$ units\
$\mathrm { m } \widehat { ( \mathrm { BFC } ) } = \mathrm { x }$
Accordingly, what is $\cot ( x )$?\
A) $\frac { 1 } { \sqrt { 2 } }$\
B) $\frac { 1 } { 3 }$\
C) 1\
D) $\sqrt { 3 }$\
E) 2