Respuesta :
The information that supports the claim is that typing in messages was a boring task, so operators took shortcuts, like choosing three letters in a row or other simple, predictable patterns.
What is Enigma machine?
The Enigma machine is known to be a form of a cipher device made and one that was used in the early- to mid-20th century and it helps to protect commercial, diplomatic, and other forms of communication system.
Note that The information that supports the claim is that typing in messages was a boring task, so operators took shortcuts, like choosing three letters in a row or other simple, predictable patterns.
Hence option d is correct.
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