What are the two activity types in BPMN?

• A. Gateways and nodes
• B. Tasks and subprocesses
• C. Events and tasks
• D. Subprocesses and artifacts

Answer: (B)

Two activity types in BPMN are Tasks and Subprocesses. An Activity is something that gets done within a process. A Task represents a single unit of work, like approving an invoice or sending a notification, usually performed by one performer and with a straightforward flow. A Subprocess is a higher-level container that groups multiple activities into one unit of work; it can be expanded on the diagram to show its internal sequence, events, and gateways, or collapsed to keep the diagram concise. This distinction matters because it lets you model at the right level of detail: use a Subprocess to encapsulate a set of steps, then drill into its internal Tasks when needed. The other options mix different BPMN element types (gateways are control flow elements, events represent things that happen, and artifacts are supplementary information), so they don’t describe the two forms of activities.