PL/SQL programs are written as lines of text using a specific set of characters.

• A. Upper- and lower-case letters A .. Z and a .. z
• B. Numerals 0 .. 9
• C. Symbols ( ) + - * / < > = ! ~ ^ ; : . ' @ % , " # $ & _ | { } ? [ ]
• D. Tabs, spaces, and carriage returns
• E. All mentioned above