Select all and only the acceptance problems below that are decidable.

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Choice $1$ of $5$:The acceptance problem for DFA,

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A

DFA

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Choice $2$ of $5$:The acceptance problem for NFA,

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A

NFA

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Choice $3$ of $5$:The acceptance problem for regular expressions,

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A

REX

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Choice $4$ of $5$:The acceptance problem for PDA,

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A

PDA

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Choice $5$ of $5$:The acceptance problem for CFG$,$

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A

CFG

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