NIST definition of cloud computing

Question:
According to the US National Institute of Standards and Technology (NIST) definition of "cloud computing" - what is the meaning of the statement "a shared pool of configurable computing resources"?

1. Five essential characteristics, three deployment, and three service models
2. Leveraging cloud services over the open internet on hardware owned by the cloud provider
3. Networks, servers, storage, applications, and services
4. Data security associated with data loss or unavailability causing business disruption

Answer:
C - is the correct answer. These are all recognized as computing resources that can be configured as needed and shared