Question: 4 . Let ALLDFA = { hAi | A is a DFA and L ( A ) = Sigma } . Here, L (

4. Let ALLDFA ={hAi | A is a DFA and L(A)=\Sigma }. Here, L(A) refers to the language
recognized by DFA A, and \Sigma refers to the input alphabet of A. Show that ALLDFA is
decidable.

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