What was the purpose of this poster?

to convince people to buy war bonds by instilling fear in them
to explain the role that children played in the war
to illustrate how close the Axis powers progressed in relation to the US
to educate people on how to use war bonds

One of the author’s purposes in the code book is to explain different types of codebreaking to his readers. which line best demonstrates this purpose? a theoretical breakthrough would be a fundamentally new way of finding alice's private key mathematicians have been studying factoring for centuries, and modern factoring techniques are not significantly better than ancient techniques a more recent development is the so-called tempest attack, which aims to detect the electromagnetic signals emitted . . in a computer's display unit if scientists could build a quantum computer, it would be able to perform calculations with . . enormous speed