The correct answer is (a) Mail merge.
Mail merge is a feature in Microsoft Word that allows you to create personalized letters, labels, envelopes, and other documents that include information from a database or spreadsheet. To use mail merge, you first create a main document that contains the text that will be the same for all of the merged documents. Then, you create a data source, which is a file that contains the information that will be different for each merged document. Finally, you merge the main document and the data source to create the final documents.
E-mail is a method of exchanging messages over the Internet. To send an e-mail, you first need to create an e-mail account with an e-mail provider, such as Gmail or Yahoo! Mail. Once you have an e-mail account, you can use a web-based e-mail client or a desktop e-mail client to send and receive e-mails.
Hyperlinking is a way to create a link between two documents or web pages. When you click on a hyperlink, it will take you to the linked document or web page. Hyperlinks are often used in web pages to allow users to navigate between different pages.
(d) None of these is not the correct answer because mail merge is the only option that allows you to produce multiple letters and labels.