Choose the valid identifiers from those listed here. (Choose all that apply.)
BigOlLongStringAAAAAAAAAAAAAAAAAAAAAA$int bytes $1 finalist A, B, C, D, E.
All of the identifiers are valid.
An identifier begins with a letter, a dollar sign, or an underscore; subsequent characters may be letters, dollar signs, underscores, or digits.
And of course keywords and their kin may not be identifiers.