Read the excerpt from "The Enigma Machine.” Cryptologists looked for cribs, which are repeated expressions in messages. Sloppy operators would repeat phrases like "nothing to report" or "weather forecast" (Wettervorhersage), which served as clues. If there were no cribs to be found, the British would send out false information about, say, British mines planted in a given area. The Germans might then send messages with the name of that area, which would provide clues about deciphering that code.

Which is the meaning of the word cryptologists?

A - people who study weapons
B - people who study codes
C - people who study marine life
D - people who study ships