Which early Nirvana trait best defined their Sub Pop era sound?

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Sub Pop Underground Era (1987-1990) poll options
Sub Pop Underground Era (1987-1990)
Nirvana: Formation to Sub Pop Records Era (1987-1990)
Nirvana
- Cobain's raw, wounded vocals
- The sludge-heavy guitar attack
- The punk-meets-pop songwriting
- The chaotic underground energy