Comprehensive and Detailed Step-by-Step Explanation:
Recovering from ransomware attacks often depends on having a robust data recovery strategy:
A). Automatic quarantine of systems: This can limit the spread of ransomware but does not address recovery.
B). Thorough communication plans: Communication is important during incidents but does not directly mitigate ransomware.
C). Effective backup plans and processes: This is the BEST option because having backups ensures that encrypted data can be restored, minimizing downtime and data loss.
D). Strong password requirements: This helps prevent unauthorized access but is not sufficient to combat ransomware once it has entered the system.
Reference: CISM Job Practice Area 4 (Information Security Incident Management) stresses the importance of backup and recovery strategies to mitigate ransomware risks.

Consistent security is the primary reason for integrating the various assurance functions of an organization for the information security manager because it ensures that the security policies and standards are applied uniformly and effectively across different domains, processes, and systems of the organization.
Comprehensive audits are not the primary reason for integrating the various assurance functions, but rather a possible outcome or benefit of doing so. A security-aware culture is not the primary reason for integrating the various assurance functions, but rather a desirable state or goal of the organization. Compliance with policy is not the primary reason for integrating the various assurance functions, but rather a basic requirement or expectation of the organization. References: https://www.isaca.org/resources/isaca-journal/issues/2016
/volume-4/integrating-assurance-functions https://www.isaca.org/resources/isaca-journal/issues/2017/volume-
3/how-to-measure-the-effectiveness-of-your-information-security-management-system

The CISM Review Manual emphasizes that the success of a DRP (Disaster Recovery Plan) depends greatly on clear communication of the plan to all stakeholders. Stakeholders must be aware of their roles and responsibilities during an incident to ensure the plan can be effectively executed. While testing, updating, and reviewing the plan are also important, communication is critical to effective execution.
Reference:ISACA CISM Review Manual, 16th Edition, Page 250-251, "Disaster Recovery Planning - Key Success Factors".

The Recovery Time Objective (RTO) specifies the maximum acceptable downtime before operations must resume. A 30-minute requirement directly defines the RTO for those systems.
"RTO defines the duration within which systems must be restored following an outage to prevent unacceptable business impact."
- CISM Review Manual 15th Edition, Chapter 3: Business Continuity Planning, Section: Continuity Metrics*