What term is used to describe the property of a secure network where a sender cannot deny having sent a message?

What do you need to know & understand about global expansion.

How can a user open a blank presentation? 1.on the file menu, click new, and then click recent templates 2.on the file menu, click new, and then click blank presentation 3. on the view menu, click templates, and then click recent templates 4. on the view menu, click samples, and then click blank presentation

The forerunner to cell phones, pdas, and smartphones was