CI requires [6] a)CI server b)CI server + SCM c)SCM d)CI server + SCM + Scripts

Continuous Integration (CI) is a development practice that requires developers to integrate code into a shared repository several times a day. Each check-in is then verified by an automated build, allowing teams to detect problems early.

To implement CI, you would need:

a) CI server: This is the central place where all the integration and testing processes happen. It monitors the main repository and triggers a CI process every time it detects a change. Examples of CI servers include Jenkins, Travis CI, and CircleCI.

b) CI server + Source Control Management (SCM): SCM is a tool that helps manage changes to source code over time. It keeps track of modifications, allows for version control, and helps resolve conflicts. When combined with a CI server, it ensures that every change made to the code is tested and validated. Examples of SCM include Git, Mercurial, and Subversion.

c) SCM: As mentioned above, SCM is essential for managing changes to the source code. However, without a CI server, there would be no automated way to integrate and test the changes.

d) CI server + SCM + Scripts: Scripts are used to automate the build and deployment processes. They are essential for a fully functioning CI system as they allow for the automation of repetitive tasks, reducing the chance of human error.

So, the correct answer is d) CI server + SCM + Scripts. This combination provides a complete CI system, allowing for automated integration, testing, and deployment.