Which extensions aren't available in used Joomla?Question 2Select one:a.Features moduleb.Pluginsc.Componentsd.Modules

To determine which extensions aren't available in the used version of Joomla, let's analyze the options provided:

Options Analysis:

1. Features module: This typically refers to a module that showcases various site features, which is generally available in Joomla.
2. Plugins: These are one of the standard extension types in Joomla that enhance functionalities.
3. Components: This is a core type of extension in Joomla that provides a more complex code structure to add features to the site.
4. Modules: These are also standard extensions used to display content in various places of the Joomla site.

Based on the standard Joomla structure, all the options given (modules, plugins, components) are essential parts of the Joomla framework, with a "Features module" being more of a specific application of a module rather than a distinct type of Joomla extension.

Conclusion:

Since all listed options pertain to extensions in Joomla, we would need more context to identify "which extensions aren't available." However, based on typical Joomla terminology and usage:

Final Answer:

None of the listed options are extensions that are inherently unavailable; they all exist within Joomla's extension structure.