The option for sending same document or letter at different addresses is

Concept

Mail Merge is a word-processing feature that produces many personalised copies of a single document by combining one fixed master document (the template) with a data source (a list of names, addresses, or other fields). The same body text is reused while the variable fields change for each record.

Application

Here a single letter or document has to reach many different addresses. Mail Merge fits exactly: you write the letter once, attach an address list as the data source, and the feature generates one output per address automatically. So the matching word-processing tool is Mailmerge.

Contrast

• "Form letters" names the OUTPUT documents that a merge produces, not the feature that creates them and links a master document to an address list.

• "Printing" only puts an already-prepared document on paper; it neither merges in an address list nor personalises copies.

• Because a definite matching feature exists, "None of the above" does not apply.