What is the universal MAC address for broadcast?

In a shared network environment, using the Contact Card option, you could do the following with certain authors of the spreadsheet:

A) reply to an email. B) add an address file. C) send an email. D) open Word.

Your organization implements hard drive encryption on a file server. Which security tenet will this cover?

A. Confidentiality B. Integrity C. Availability D. Accountability