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.

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Answer: B