Question

trains people to listen to voice recordings to determine who’s speaking or read e-mail and other writings known to be by a certain person and determine whether that person wrote the e-mail or letter in question.

Answer 1

idk

Step-by-step explanation:

Answer 2

They listen to voice recordings

Step-by-step explanation:

The trains people listen to voice recordings. The voice recordings allow the trains people to make sure that the messages as they are transmitted during the course of the journey. The voice recordings allow the messages to be stored and archived for latter events, say in the events of an accident.