I would say C, D, E.
Take a closer look to Application Lifecycle and Development Models Salesforce module.
https://trailhead.salesforce.com/content/learn/modules/application-lifecycle-and-development-models/understand-what-application-lifecycle-management-is
I will take some parts written along the module:
1. In the second unit of the module, it has a title “Release on a consistent schedule” with the following “Aim to release at regular intervals and on a given day of the week”.
2. About the steps of the ALM cycle, on Step 6 Release it stays “Train your employees and partners so they understand the changes”.
3. It has a section that talks about “What can happen if you don’t test changes before making them available in production?”. And thinking a little bit outside of the box that should be the reason why ALM was developed to follow the proper practices for deployments up to production to avoid deploying defects.