Given the following pseudocode function:

Function Sort$3($L$1,$ L$2,$ L$3)$

K$1=$ Sort$($L$1)$

For each element, E$1,$ of L$1,$

Add E$1$ to each element of L$2$

K$2=$ Sort$($L$2)$

For each element, E$2,$ of L$2$

Add E$2$ to each element of L$3$

K$3=$ Sort$($L$3)$

End$-$For

End$-$For

L $=$ Append lists K$3,$ K$1,$ and K$2$

return L

Which function dominates the run time of Sort$3($L$1,$ L$2,$ L$3)?$