Which of the following directories contains information, documentation and example configuration files for installed software packages?

This directory typically contains default configuration files for system services and applications. While it may define default settings, it does not provide user documentation or example configurations for installed software, which is the primary focus of the question.

The /var/info/ directory is generally used to store info files, which are a type of documentation format. However, it is not the main directory for comprehensive software documentation and examples, thus making it an incorrect choice for this question.

The /doc/ directory is not a standard location in Unix-like systems for software documentation. While it may exist on some systems, it lacks the universal recognition and specific purpose that /usr/share/doc/ serves for storing documentation and configuration files.

The /usr/examples/ directory is intended for storing example files and code snippets for various software, but it does not typically contain comprehensive documentation. Therefore, it does not fulfill the criteria of being a primary source for information and documentation on installed packages.