Which of the Following Can Be Considered Beta Testing

Which of the following can be considered beta testing?

A) A programmer at Linus Systems checks the integration of multiple modules of an information system.
B) Software testers compare the finished system against user requirements to see if it satisfies all necessary criteria.
C) Taro Inc.checks the correctness of the modules of its new information system.
D) System users at URP feed data into a new information system to test its capability.
E) MNP Inc.checks the system to ensure that it meets all the necessary design requirements.