OmegaTech Corp identified unauthorized remote access to its primary server and data exfiltration tunnels.

Comprehensive and Detailed Explanation (ECIH-aligned):

ECIH prioritizes containment of the most critical threat vector. The primary server actively exfiltrating data represents the highest risk.

Option B is correct because isolating the primary server immediately stops data loss and attacker control. IoT remediation can follow once core assets are secured.

Options A and D delay containment. Option C causes unnecessary disruption.

ECIH stresses that responders must address the most damaging threat first, making Option B correct.