To answer this question, you need to understand the concept of COTS.
COTS stands for Commercial off-the-shelf software. This refers to software products that are readily available for purchase from third-party vendors. COTS software is designed to be used "as is" without requiring any significant customization or modification.
Let's go through each option to understand why it is correct or incorrect:
Option A) Commercial off-the-shelf software - This option is correct. COTS stands for Commercial off-the-shelf software.
Option B) Commerce of the System - This option is incorrect. It does not accurately represent what COTS stands for.
Option C) Configuration of the System - This option is incorrect. It does not accurately represent what COTS stands for.
Option D) Commercial off-the Shelf system - This option is incorrect. It is similar to option A, but it uses "system" instead of "software," which is not the correct representation of COTS.
The correct answer is A) Commercial off-the-shelf software. This option is correct because it accurately represents what COTS stands for.