Please advise if my answers to the question below are correct. If they are not please let me know the correct answer and the explanation. Thank you!

2017 Question 1 In the programming language Pascal, an identifier is a sequence of Roman letters and Arabic digits. An identifier always starts with a letter. The shortest identifier is a single character Note: Do not unpack or expand the definitions of digit and letter in your answers to (a), (b), (c) and (d) (a) Give a regular expression for Pascal's representation of identifiers, making use o letter and digit as defined below. [5] Ic=(abcdefghijkImnopqrstuvwxyz)uc=(ABCDEFGHIJKLMNOPQRSTUVWXYZ)letter=(Ic|uc)digit=(0|1|2|3|4|5|6|7|8|9) Answer letter+(letter|digit) (b) Translate the regular expression given in your answer to (a) into a Non-deterministic Finite Automaton (NFA), showing your working. [7] Answer| NFA State Transition Table (Working) (c) Translate the Non-deterministic Finite Automaton given in your answer to (b) into a Deterministic Finite Automaton (DFA), showing your working. [8] Answer DFA cannot have dead configuration We will have to create a new state to handle . This is known as the dead state or trap state In a DFA we need to show for a particular input which state it will go (d) Using your answer to part (b) of this question, give a state-transition lookup-table for parsing identifiers