Containment (C)is thefirst critical stepduring a security incident tostop the spreadof the attack. This could include isolating affected systems, disabling accounts, or blocking malicious traffic. According to theIncident Response Lifecycle, the order is typically:Identification # Containment # Eradication # Recovery # Lessons Learned. Reference: CompTIA Security+ SY0-701 Objectives, Domain 5.4 - "Incident response process: Containment as the immediate action."