The blank is supposed to be "distributed" so the sentence goes like this "A distributed database supports data distributed across several different sites"<span />
Answer: Alpha testing
Explanation:
Alpha testing is basically perform to identify the issues and bugs before release any product. This type of testing basically place the products within firm and performed different types of applications.
The alpha testing is usually perform before the release any software products. It is the combination of both white and black box testing. The main function of this testing is to simulate the users by carried out different tasks to perform.
The alpha testing is known as alpha because it is done at the end of the software development.
Infrastructure as a service (IaaS) is a cloud computing offering in which a vendor provides users access to computing resources such as servers, storage and networking. Organizations use their own platforms and applications within a service provider's infrastructure.