Which statement best expresses a central idea of this passage? A. People should always keep two feet of air space around them.
B. Typical North Americans do not like to interact with each other at all.
C. Typical North Americans greet each other with a handshake.
D.
People should consider greeting each other with handshakes.

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 mark this and return save and exit next submit