This is a " Hidden Text " attack, where an attacker tricks an LLM by embedding instructions that the human reader cannot see but the machine can process. The most effective " Incident Management " control is " Text Sanitization " that specifically strips out invisible formatting, hidden HTML tags, or zero-width characters before the text is sent to the AI. Adding instructions (Option B) is unreliable because prompt injections are specifically designed to " override " previous instructions. Lowering the temperature (Option A) reduces creativity but doesn ' t stop the model from following a clear, albeit hidden, command.