In the diagram of six adjacent angles shown above, which of the following must be true?

- The sum of the six angles is $latex 360 \textdegree $
- All six angles are congruent to each other.
- Any pair of adjacent angles is supplementary

- I, only (check answer)
- II, only (check answer)
- I and II, only (check answer)
- I and III, only (check answer)
- I, II, and III (check answer)

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