To answer this question, you need to understand the acronym UCS.
UCS stands for Unified Computing System.
Let's go through each option to understand why it is correct or incorrect:
Option A) Unified Computing System - This option is correct because UCS stands for Unified Computing System.
Option B) Universal Character Set - This option is incorrect because UCS does not stand for Universal Character Set.
Option C) Universal Compiling System - This option is incorrect because UCS does not stand for Universal Compiling System.
Option D) Ultra Corba Simulator - This option is incorrect because UCS does not stand for Ultra Corba Simulator.
The correct answer is Option A) Unified Computing System. This option is correct because UCS stands for Unified Computing System.