When is it true that sub-processes run as a "Start Process" node?

The situation where sub-processes run as a "Start Process" node typically implies that they have their own independent execution context. This means these sub-processes are not constrained by the original process runner's execution engine and can run autonomously.

When sub-processes are initiated in this manner, each instance of a sub-process can not only execute independently but also enables greater resource allocation and system performance management. Running in different execution engines allows for processes to be isolated from one another, ensuring that any issues in one do not affect the other. This autonomy can be particularly beneficial in complex enterprise environments where processes may have varied demands.

In contrast, other options suggest scenarios where sub-processes either run in the same execution engine or do not execute at all, which does not align with the nature of a "Start Process" node where the intention is to create a separate execution context.