Immediately isolate the affected systems and restrict access to minimize further damage, without conducting any preliminary analysis to avoid delays.

Focus solely on identifying the cause and extent of the breach, delaying any containment measures to ensure the investigation is not hindered.

Notify all stakeholders, including management, legal, and regulatory authorities, before understanding the full scope of the breach to ensure transparency.

First, isolate the affected systems to prevent further damage, then conduct a thorough investigation to understand the breach's scope and cause, followed by notifying relevant stakeholders as required, and finally, implement measures to prevent future breaches.

All of the above.