Select the correct conclusion based on the meaning of the bold word: Statement: These days he is working on amonograph which is very important for him.
i. He is writing a memoire of his father who was a successful poet.
ii. His work on a specialized subject is an important resource for scholars.
iii. He is rehearsing his lines for the play to be performed at the annual function.
iv. He is creating an architectural masterpiece out of a single piece of stone.