How does the National Institute of Standards and Technology define a Hybrid Cloud?

How does the National Institute of Standards and Technology define a Hybrid Cloud?

A.
A combination of private and public Clouds for a single organization

B.
A common environment for use by a group of related organizations

C.
Separate environments for use by multiple organizations

D.
A combination of community and public Clouds for a single organization

E.
A combination of private and public Clouds for multiple organizations