单项选择题 Validate Scope is the process of formalizing acceptance of completed（ ）.

单项选择题 （ ）is a computer technology that headsets,sometimes in combination with physical spaces or multi-projected environments,to generate realisitic images,sounds and other sensations that simulate a user’s physical presence in a virtual or imaginary environment.

单项选择题 （ ）：a cloud service,allied to the set of business terms under which the cloud service is offered.