Which of the following sentences uses punctuation correctly?
1) walt whitman spent most of his adult life writing and revising leaves of grass, a collection of poetry written in free verse; the most famous poem in the collection is entitled song of myself.
2) walt whitman spent most of his adult life writing and revising "leaves of grass," a collection of poetry written in free verse; the most famous poem in the collection is entitled "song of myself."
3) walt whitman spent most of his adult life writing and revising leaves of grass, a collection of poetry written in free verse; the most famous poem in the collection is entitled "song of myself."
4) walt whitman spent most of his adult life writing and revising "leaves of grass," a collection of poetry written in free verse; the most famous poem in the collection is entitled "song of myself."
