A spelling relation rather than a guessed sound
A learner is comparing བོད་ཀྱི་དེབ with མིག་གི་ཆུ. The task concerns the written connective, not a compulsory pronunciation in every regional variety. In the first phrase, བོད ends in d; in the second, མིག ends in g. Another learner applies an inaccurate table that puts both endings in the same group. A third reverses the modifier relation when translating the first phrase, making Tibet belong to a book. The exercise asks for an explanation grounded in spelling and phrase structure. It does not require a claim about a current examination's prescribed chapter, and it does not establish that every occurrence of a connective expresses literal ownership.
1. Which forms are justified?
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The d ending takes ཀྱི, while the g ending takes གི. These are conventional written alternatives of the connective family.
2. How should the first relation be read?
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The phrase associates the book with Tibet, naturally a Tibetan book or book of Tibet in context. It does not reverse the relation to mean Tibet belonging to a book.