All the data in an array do not have to be the same data type.

Any user on a given email system can send a message and have it pop up instantly on the screen of anyone else logged onto that system using ________.

A. attachments B. instant messaging C. list-serves D. spam

In PKI, the CA periodically distributes a(n) _________ to all users that identifies all revoked certificates.

A. CRL B. RA C. MAC D. RDL