Question: letter = a / b / c / dLETTER = A / B / C / Ddigit = 4 / 5 / 6 / 7

letter = a/b/c/dLETTER = A/B/C/Ddigit =4/5/6/7/9Consider the regular expression R2=(digit |?|!)(letter digit)(LETTER | letter). Which of the following is correct (more than one choice or no choice can be correct

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