Read the excerpt from The Dark Game: True Spy Stories from Invisible Ink to CIA Moles. [T]he Germans committed some blunders in the way they sent their secret radio messages, giving the British help in their task. The first mistake of German intelligence was the error of arrogance, believing that the British were not up to the challenge of deciphering their messages. Another mistake they made was sending duplicates and even triplicates of some of their messages, with each one using a different cipher key.

Which word best describes the tone of the passage?

critical
apologetic
objective
discouraged
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