Which of the following cloud characteristics describes computing capabilities that can be provisioned without human interaction from the service provider?

The National Institute of Standards and Technology (NIST) defines five essential characteristics of cloud computing. "On-demand self-service" is the characteristic that allows a consumer to unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with the service provider. This directly matches the description in the question. This capability empowers users and is a fundamental element of the cloud service model.

B. Measured service refers to the cloud system's ability to control, optimize, and meter resource usage, which is primarily used for billing and resource tracking.
C. Broad network access means services are available over the network and accessed through standard mechanisms (e.g., web browsers, mobile apps), focusing on accessibility.
D. Agile service management is a methodology for managing IT services, not one of the five essential characteristics of cloud computing defined by NIST.

1. Mell, P., & Grance, T. (2011). The NIST Definition of Cloud Computing (Special Publication 800-145). National Institute of Standards and Technology. Page 2, Section 2, "Essential Characteristics," defines "On-demand self-service." (DOI: https://doi.org/10.6028/NIST.SP.800-145)

2. ISACA. (2021). Cloud Computing for Auditors. Chapter 1, "Cloud Computing Concepts," outlines and explains the five NIST essential characteristics, including on-demand self-service.

3. Armbrust, M., et al. (2009). Above the Clouds: A Berkeley View of Cloud Computing. University of California, Berkeley. EECS-2009-28. This foundational paper discusses the economic and technical drivers of cloud computing, including the concept of utility computing which aligns with on-demand self-service.