Question

define data source and main document
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Answer 1

Answer:

The data source is a document, spreadsheet or database that contains personalized information such as names, addresses, and phone numbers. The Main Document can be a Form Letter, Labels, Email, or Directory.

Explanation:

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Answer 2

Answer:

*Maindocument* this is the document that contains the letter or text which is to be sent .for example an invitation

data source this is the file where the addresses of all the recipients are stored