To answer this question, you need to understand the concept of beta testing.
Beta testing is the process of testing a software product in the real-world environment by actual end-users. It is performed by customers at their own site, which means option C is correct.
Now let's go through each option to understand why it is correct or incorrect:
Option A) performed by an Independent Test Team - This option is incorrect because beta testing is not performed by an independent test team. It involves the actual customers or end-users of the software.
Option B) performed by customers at the software developer’s site - This option is incorrect because beta testing is not performed at the software developer's site. It is performed by customers at their own site.
Option C) performed by customers at their own site - This option is correct because beta testing is indeed performed by customers at their own site. They use the software in their own environment and provide feedback to the software developer.
Option D) performed as early as possible in the lifecycle - This option is incorrect because beta testing is typically done in the later stages of the software development lifecycle, after the software has gone through alpha testing and is considered to be stable enough for external testing.
The correct answer is C) performed by customers at their own site. This option is correct because it accurately describes beta testing.