How do you know that a Development Team is cross-functional?

How do you know that a Development Team is cross-functional?
A . Development Team has all the skills to create a potentially releasable increment by the end of every Sprint.
B . A few of the Development Team members pair program and do Test Driven Development.
C . There are no conflicts within the Development Team.
D . Every member of the Development Team is able to perform every task.

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Answer: A