Question: User if sigma = { a , b } and L = { ab , ba } , which of the following languages represent ?

User
if sigma ={a,b}
and L ={ab, ba}, which of the following languages represent
?
Question 1 options:
{abab, abba, baab, baba}
{abab, abba}
{abab, baba}
{ab, ba, abab, baba}

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