To answer this question, you need to understand the different testing techniques and their purposes. Let's go through each option to understand why it is correct or incorrect:
Option A) Alpha testing - This option is incorrect because alpha testing is performed at the developer's site by a dedicated testing team. It is not focused on installing the system at user sites.
Option B) Volume testing - This option is incorrect because volume testing is a performance testing technique that verifies the system's behavior under a large volume of data. It does not involve installing the system at user sites.
Option C) Beta testing - This option is correct because beta testing involves installing the system at a large number of user sites. It is performed by end-users in a real-world environment to gather feedback and identify any issues or bugs before the final release.
Option D) Boundary value analysis - This option is incorrect because boundary value analysis is a technique used to test the system's behavior at the boundaries of input values. It does not involve installing the system at user sites.
The correct answer is C) Beta testing. This option is correct because beta testing is the testing technique that involves installing a system at a large number of user sites for real-world usage and feedback gathering.