Is the word understand a compound word

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

Which of the following would not be a good supporting sentence for an example paragraph with the following topic sentence?

Compare and contrast the merits and drawbacks of at least two of the scholarly approaches to literature described in this unit. be sure to mention at least one advantage that each approach has over the other. use one of the readings from this unit in your comparison. your answer should be at least 250 words.