The correct answer is A. True.
A rule-based system is a system that uses a set of rules to make decisions. The rules are typically in the form of IF-THEN statements, such as “IF the temperature is above 90 degrees, THEN turn on the air conditioner.” The system can then use these rules to make decisions about what actions to take in different situations.
Rule-based systems are often used in expert systems, which are systems that can make decisions like a human expert. For example, an expert system for diagnosing diseases might use a set of rules to determine which disease is most likely based on the patient’s symptoms.
Rule-based systems can also be used in simpler applications, such as spam filters. A spam filter might use a set of rules to determine whether an email is spam or not. For example, the rule might be “IF the email contains the word ‘free’, THEN it is likely spam.”
Rule-based systems are a powerful tool that can be used to make decisions in a variety of applications. However, they can also be difficult to create and maintain, as the rules must be carefully designed to ensure that they make the correct decisions in all situations.