ISO 27017 is specifically designed as an international standard that provides guidelines for information security controls applicable to cloud services. It extends the ISO/IEC 27002 standard by adding cloud-specific implementation guidance for both cloud service providers and cloud service customers. The community discussion shows unanimous consensus (100% for option C) with multiple references to official Google Cloud documentation and ISO standards confirming that ISO 27017 is the correct answer. ISO 27001 is a general information security management system standard, ISO 27002 provides general security controls guidance, and ISO 27018 focuses specifically on privacy protection in cloud services - none of these are specifically tailored for cloud service provisioning and use like ISO 27017.