Which excerpt from "The Enigma Machine” supports the claim that German soldiers accidentally helped the Allies figure out the Enigma codes?

*With the right settings, the recipient only needed to type in the encrypted text and the message would light up in plain text.
*To use the Enigma machine, an operator typed a message into the machine, which would be scrambled by three rotors . . .
*The Polish intelligence developed the "bomba", a complicated system of wires and rotors to scan and decode messages within hours.
*Typing in messages was a boring task, so operators took shortcuts, like choosing three letters in a row or other simple, predictable patterns.

Question

Which excerpt from "The Enigma Machine” supports the claim that German soldiers accidentally helped the Allies figure out the Enigma codes?

*With the right settings, the recipient only needed to type in the encrypted text and the message would light up in plain text.
*To use the Enigma machine, an operator typed a message into the machine, which would be scrambled by three rotors . . .
*The Polish intelligence developed the "bomba", a complicated system of wires and rotors to scan and decode messages within hours.
*Typing in messages was a boring task, so operators took shortcuts, like choosing three letters in a row or other simple, predictable patterns.