The book manzil-abadi (part of Ain-i Akbari) includes which subject as its main content?

Imperial household and its maintenance

The correct answer is Option (3) → Imperial household and its maintenance

The Ain is made up of five books (daftars), of which the first three books describe the administration. The first book, called manzil-abadi, concerns the imperial household and its maintenance. The second book, sipah-abadi, covers the military and civil administration and the establishment of servants. This book includes notices and short biographical sketches of imperial officials (mansabdars), learned men, poets and artists.