A community cloud is the ideal model for this scenario. By definition, this deployment model involves a cloud infrastructure provisioned for exclusive use by a specific community of consumers from organizations that share common concerns, such as mission, policy, security requirements, and compliance considerations. A group of universities collaborating on research or shared services is a classic example of such a community, allowing them to pool resources and tailor the environment to their specific academic and research needs.

A. Private: A private cloud is dedicated to a single organization, which does not fit the "group of universities" scenario.

B. Public: A public cloud is available to the general public and is not specifically provisioned for a select group with shared interests.

C. Hybrid: A hybrid cloud combines other models (e.g., private and public). While the community could use a hybrid approach, "Community" is the specific model that describes the collaborative arrangement itself.

1. Mell, P., & Grance, T. (2011). The NIST Definition of Cloud Computing (NIST Special Publication 800-145). (Page 3, Section "Deployment Models," provides the authoritative definition: "Community Cloud. The cloud infrastructure is provisioned for exclusive use by a specific community of consumers from organizations that have shared concerns...").

2. Massachusetts Institute of Technology. (2016). Massachusetts Open Cloud. (The MOC is a real-world example of a community cloud for academic research, involving multiple universities like MIT, Harvard, Boston University, and others, demonstrating the model's application in this exact context). Retrieved from the Massachusetts Open Cloud website.

3. Badger, L., Grance, T., Patt-Corner, R., & Voas, J. (2011). Cloud Computing Synopsis and Recommendations (NIST Special Publication 800-146). (Section 3.2, "Cloud Deployment Models," reiterates the NIST SP 800-145 definition and provides context on its use cases).