What is the relationship between ISO/IEC 20000-1, ISO 9001, and ISO/IEC 27001?

What is the relationship between ISO/IEC 20000-1, ISO 9001, and ISO/IEC 27001?
A . ISO 9001 deals mainly with customer complaints about quality, whereas ISO/IEC 20000-1 and ISO/TEC27001 are IT focused
B . ISO/IEC 20000-1 applies to service management, whereas ISO 9001 and ISO/IEC 27001 can NOT be used effectively in a service provider organization
C . An SMS can be integrated with a quality management system based on ISO 9001 or an information security management system based on ISO/IEC 27001
D . It is necessary for service provider organizations to be certified against all of them to ensure an effective service management system

Answer: C