One Reason for Having a Monetary Policy Framework Is

One reason for having a monetary policy framework is:

A) It makes clear what specific goals the central bankers are pursuing
B) It provides leeway for central bankers to change their goals without communicating the change and disrupting financial markets
C) It provides central bankers the secrecy needed to perform their jobs effectively
D) It can make goal setting vague enough so that the central bankers can always claim success