Correct option is B
• Header → Used to insert repeating elements like document title, logo, page numbers, date, etc., at the top section of each page → ensures consistent document design and branding.
• Mail Merge → Used for mass personalization in letters/emails/envelopes by merging main document with a recipient database (Excel/CSV/Outlook).
• Automates name, address, unique data fields → avoids repetitive typing and errors.
• Common use cases: offer letters, admit cards, newsletters, certificates, bulk mails.
Correct mapping:
Top of every page → Header
Personalized multiple documents → Mail Merge
So, the correct answer is Header; Mail Merge.