What causes the runtime error DEBUGGING_NOT_POSSIBLE when starting the Debugger?

The runtime error DEBUGGING_NOT_POSSIBLE usually occurs under specific conditions that prevent the debugger from initializing properly. In this case, the correct choice is that starting a non-exclusive mode in a productive system can lead to this error.

When the debugger is initiated in a non-exclusive mode, it often results in complications on production systems which are expected to operate with higher levels of stability and performance. Non-exclusive mode allows multiple users to access the debugger concurrently, which can cause resource conflicts, unintended issues, or performance degradation. Production systems typically should not have development tools like the debugger running due to these risks.

The other options relate to session limitations or maximum debugging session constraints but do not define situations where the execution environment becomes unsuitable for debugging the way starting a non-exclusive mode in a productive system does. For example, options referring to session limits deal with system-imposed limits that can lead to issues, but they don’t inherently define the fundamental operational context that leads to a debugging error in a productive, non-exclusive environment.