Which technique can increase performance by sending independent streams of information at the same time over the same frequencies?

Jeremy is preparing a presentation on e-mail basics to present to his computer club. Jeremy knows that a basic e-mail message should include all of the following EXCEPT: ____.

A. subject line B. attachment C. address D. body of the message

Consider a hash table of size 500, and the hash function is i^3 mod 500. Which location is the key 1234 mapped to?

a. 404 b. 4 c. 500 d. 904