What is a functionality of the Waterfall method as compared to the Agile method for software development?

What is a functionality of the Waterfall method as compared to the Agile method for software development?

A. Waterfall increases agility to implement faster while Agile promotes reliability. B. A phase begins after the previous phase has ended in Waterfall while Agile phases run in parallel. C. Customers get feedback during the process in Waterfall while they can see the result at the end in Agile. D. Requirements can be updated in Waterfall while in Agile it should be gathered in the beginning.