Which expressions about central bank bills below are right ( ).

A、They are short-term debt certificates issued by the central bank to commercial banks, and are essentially central bank bonds;

B、The issue of central bank bills is an important means for the central bank to conduct monetary policy operations;

C、A majority of central bank bills have a term of over 1 year ;

D、The central bank issues bills in order to raise funds;

E、The issue of central bank bills of China dated from 2012