When a control token arrives at a join node, what happens?

When a control token arrives at a join node, the behavior of the join node is to synchronize the control flow from its incoming edges. The key function of a join node is to consolidate incoming tokens before allowing a single token to continue on to the outgoing edge. This effectively means that regardless of how many tokens arrive at the join node, only one token is passed onward.

The join node requires that all incoming flows have a token present before it can pass a token out to the subsequent nodes. However, it's crucial to note that once this condition is met, the join node will offer only one token on the outgoing edge. This process ensures that the flow of control is managed correctly, adhering to the logical progression defined by the model.

Thus, the correct answer highlights the fundamental role of the join node in controlling the flow of execution, allowing only one token to proceed to the next stage of the process.