According to carl, in cloud computing, resources are said to be "pooled" because

According to Carl, in cloud computing, resources are said to be “pooled" because the physical facility provides the combined power of many computers.

Explanation:

Cloud computing, the rising style of computing that depends on Internet-based services and resources to supply computing services to customers, whereas releasing them from the burden and prices of maintaining the underlying infrastructure.

Samples of cloud computing embrace Web-based e-mail applications and customary business applications that are accessed on-line through a browser, rather than through a local desk or laptop.

Cloud computing continues to be an evolving paradigm. Its arising technologies, issues, risks, and advantages are under spirited discussion among the general public and private sectors. These can evolve and alter over time.

the answer is:

c. economic output