Which statement describes the ROWID data type?（）

• A、Binary data up to 4 gigabytes.
• B、Character data up to 4 gigabytes.
• C、Raw binary data of variable length up to 2 gigabytes.
• D、Binary data stored in an external file, up to 4 gigabytes.
• E、A hexadecimal string representing the unique address of a row in its table.