Which four are correct guidelines for naming database tables? （）

• A、Must begin with either a number or a letter.
• B、Must be 1-30 characters long.
• C、Should not be an Oracle Server reserved word.
• D、Must contain only A-Z, a-z, 0-+, _, *, and #.
• E、Must contain only A-Z, a-z, 0-9, _, $, and #.
• F、Must begin with a letter.