What was the earliest implementation of cloud computing?

What was the earliest implementation of cloud computing?
A . Providing compute resources for complex problems such as asteroid tracking.
B. Indexing large datasets across universities
C. LAN parties and cyber cafes
D. Selling un-used time slice of computing

Answer: D

Explanation:

Cloud computing means on-demand network access to shared resources. The main benefits of cloud computing is to provide faster time to market, Improved agility of applications. Selling un-used time slice of computing is the earliest implementation of cloud computing. [Exam Tips]: On-demand self-service is an essential characteristic of cloud computing.