Step 1: Understanding Secondary Colours.
Secondary colours are formed by mixing two primary colours. The primary colours are red, blue, and yellow. The three secondary colours are:
- Red + Yellow = Orange
- Yellow + Blue = Green
- Blue + Red = Purple
Step 2: Verifying the Options.
- Option (1): There are only three secondary colours, not six.
- Option (2): There are three secondary colours, not two.
- Option (3): There are only three secondary colours, not eight.
- Option (4): The correct number of secondary colours is three.
Conclusion:
Therefore, the correct answer is (4) Three.