Which access control strategy allows an object owner to determine whether to allow access to the object

The forerunner to cell phones, pdas, and smartphones was

Allison and her group have completed the data entry for their spreadsheet project. they are in the process of formatting the data to make it easier to read and understand. the title is located in cell a5. the group has decided to merge cells a3: a7 to attempt to center the title over the data. after the merge, allison points out that it is not centered and looks bad. where would the title appear if allison unmerged the cells in an attempt to fix the title problem?

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.