Select all the formulas which are logically implied by the set $\backslash$Sigma $=\{$xF$($x$)\}.$

Question $1$ options:

F$($u$)$

F$($u$)$F$($u$)$

F$($u$)$F$($u$)$

$$xF$($x$)->$xF$($x$)$

$$xF$($x$)->$xF$($x$)$