Suppose the alphabet $=\{a,b,c\},$ an V$=\{,a,$

aa$,$ aaa$\}$ and $,$ aa$,$ aaa$\}.$ Which of the

following is true about $V+W?$

$V+W$ has $12$ strings.

$V+W$ has six strings.

$V+W$ is different from $W+V$

$inV+W$