Consider the languages L$1=$

and L$2=\{$a$\}.$

Which one of the following represents L$1$ L$2*$ U L$1*$

A$)\{$

$,$ a$,$ aa$,$ aaa, aaaa, $....\}$

B$)$

C$)\{$

$\}$

D$)\{$a$,$ aa$,$ aaa, aaaa, $....\}$

Group of answer choices

A

B

D

C