Volatile memory contains critical artifacts such as encryption keys, running processes, and network connections. The ECIH Forensic Readiness module emphasizes that volatile evidence must be captured immediately before it is lost.

Option C is correct because capturing memory first preserves irreplaceable evidence, followed by securing the scene to prevent contamination. Powering down systems before memory capture would destroy volatile data.

Options A and D are incomplete without prioritization. Option B is incorrect due to evidence loss.

Thus, immediate memory capture followed by scene security is the correct action.