$ABCDEF$ is a regular hexagon\\
$|AL| = |LB|$\\
$| \mathrm { BC } | = 4 \mathrm {~cm}$\\
$| \mathrm { DK } | = 3 \mathrm {~cm}$\\
$|KE| = \mathrm { x }$\\
According to the given information above, what is x in cm?\\
A) $4 \sqrt { 3 }$\\
B) $3 \sqrt { 5 }$\\
C) $3 \sqrt { 7 }$\\
D) 6\\
E) 7