________ queries contain two or more tables and allow users to take advantage of relationships that have been set between these tables

When monitoring disk activity, a response time consistently above what level indicate a serious problem?

A. 5 ms B. 10 ms C. 20 ms D. 50 ms

Select protocols that are used for e-mail processing.

a. ETP, FTP b. SMTP, POP3 c. SMTP, POP3, IMAP d. ETP, FTP, SMTP