The horses ran across the down at great speed.” based on the context what does “down” mean?
a. an adverb meaning from a higher position to a lower one.
b. a verb meaning to drink quickly
c. an adjective meaning out of service
d. a noun meaning a field often used for racing

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