Concept:
The five basic components of a GIS are:
• Hardware
• Software
• Data
• People
• Methods
A Coordinate Reference System (CRS) is a framework used for georeferencing spatial data, but it is not considered one of the fundamental components of a GIS.
Step 1: Recall the GIS components.
The essential GIS components are hardware, software, data, people, and methods.
Step 2: Identify the option that is not a component.
Hence,
\[
\boxed{\text{Coordinate Reference System is not a basic component of GIS}.}
\]
Therefore, the correct option is
\[
\boxed{(D).}
\]