Which of the following communication technologies is used by video conferencing systems to synchronize video streams, and reduce bandwidth, sent by a central location to subscribed devices?

In Excel, you can group worksheets to enter a footer into two worksheets at a time, by pressing the ________ key while selecting the worksheets before inserting the footer.

a. Home b. Alt c. Ctrl d. Esc

________ is the delivery of applications over the Internet

A) SaaS B) PaaS C) Iaas D) CSP