Which source is NOT a valid data source for a mail merge? database
Outlook contacts
Excel worksheet
PDF document
I'll mark brainliest I'm taking a test

PDF Document

Explanation:

Here you can mark him brainliest now

Explanation:

you're welcome

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.

answerstandard;