Boolean data types are data types that can only have one of two possible values: true or false. When evaluating Boolean expressions, such as logical operators (AND, OR, NOT) or comparison operators (=, <, >, etc.), the result is also a Boolean value. Therefore, there are only two possible results when evaluating Boolean data types: true or false. References:
The Official CompTIA IT Fundamentals (ITF+) Student Guide (Exam FC0-U61), Chapter 6: Software Development Concepts, pages 6-10 to 6-11.
CompTIA IT Fundamentals Certification Training, Module 6: Software Development Concepts, Lesson
2: Programming Concepts.