Q:

In some programming languages, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denotes the sets of letters and digits respectively, which of the following expressions define an identifier ?

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In some programming languages, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denotes the sets of letters and digits respectively, which of the following expressions define an identifier ?


  1. ( L . D )*
  2. ( L∪ D ) *
  3. L . ( L . D )*
  4. L ( L ∪ D)*

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(d).L ( L ∪  D)*

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