What is the difference between statistical detection and rule-based detection models?

What is the difference between statistical detection and rule-based detection models?

A. Rule-based detection involves the collection of data in relation to the behavior of legitimate users over a period of time B. Statistical detection defines legitimate data of users over a period of time and rule-based detection defines it on an IF/THEN basis C. Statistical detection involves the evaluation of an object on its intended actions before it executes that behavior D. Rule-based detection defines legitimate data of users over a period of time and statistical detection defines it on an IF/THEN basis