" is a way to conduct collaborative live meetings or presentations over the Internet, where each participant sits at his or her own computer and is connected to other participants via the Internet."

solution:

the right option is a

to adding   a new row to a table we   have to do process last table cell and pressing tab.

this is the process to add new row in the cell:

* to add a row below the cell, click insert below in the rows and columns group.

thus this is the required right answer.