Final answer:
In risk management, 'Ignore' is not a valid risk response technique; instead, recognized responses include accepting, avoiding, transferring, or mitigating risks as part of effective management.
Step-by-step explanation:
The risk response technique that is not valid is Ignore. In risk management, particularly within the context of project management or business strategies, there are several recognized techniques to respond to risks. These techniques include Accept, where the risk is acknowledged but no active steps are taken to avoid or mitigate it; Avoid, where steps are taken to remove the risk or to change the project plan to circumvent it; and Transfer, which involves shifting the risk to another party, typically through insurance or outsourcing.
Ignoring a risk is not considered a valid response strategy in professional risk management because it suggests a lack of engagement with potential threats or opportunities which could lead to unaddressed problems. Effective risk management requires the identification, assessment, and response to risks.