What do you understand by Copado Functions Image?

Comprehensive and Detailed 100to 150 words of Explanation From Copado Extension builder topics:

A Copado Functions Image is a container that includes the pre-installed applications, features, tools, and libraries required to run a particular function. Option D is correct because Copado Functions execute in managed runtime environments, and the selected image determines what capabilities are available during execution. For example, one image may support general scripting, another may include Git utilities, and another may support deployment-related tooling such as DPL for Heroku deployment. Option A is incorrect because a Function Image is not a cloned sandbox version of a function. Option B is incorrect because it is not a container of Apex test scripts. Option C is also inaccurate because Function Image is not simply the overall configuration of a Function.