Which of these is a placeholder in a document into which variable data is inserted during the process of a mail merge? data source main document merge field none of the above

The correct answer is no.

Answer///what is another name for a datebase server-side extention? web-to-datebase middleware this is your answer (true)

The answer is  c. 1, 1, 1.b89 is an absolute reference. there are no dollar signs indicating relativity.p$90 is a mixed reference. the p column is absolute, but the row is relative as indicated by the dollar sign in front of the row number. it's a mix of absolute and relative.$d$34 is a relative reference. both the column and the rows have dollar signs in front of them, so the entire thing is relative.there's only one of each.