Which process model notation uses rule objects like "AND," "OR," and "Exclusive OR"?

The correct choice is the Event-driven process chain (EPC), which effectively uses logical operators such as "AND," "OR," and "Exclusive OR" to model complex processes. EPCs are designed to represent business processes in a way that emphasizes events and functions, clearly highlighting how different process paths are determined based on certain conditions or rules. The use of these logical operators allows for a more nuanced and flexible representation of business processes, enabling the modeller to illustrate how different pathways can be followed based on specific triggers or decisions within the flow of the process.

The other options do not typically incorporate these rule objects in the same way. Unified Modeling Language (UML) focuses more on defining the structure of software systems and may not explicitly highlight process rules in a way similar to EPCs. Flow Charts are simple visual representations of a process flow but lack the formal use of logical operators to define complex decision points. Integrated DEFinition Methods (IDEF) provides structured methods for modeling processes but does not specifically emphasize the use of logical operators like "AND" and "OR" in the same manner as EPCs. This makes EPC the most fitting answer for the question regarding the usage of rule objects in process modeling.