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

Answer: B