Which of the following CANNOT be used as a means of transportation to reach Saturna Island, according to the text

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Which of the following CANNOT be used as a means of transportation to reach Saturna Island, according to the text?

1. It can be reached by private boat.
2. You can reach it by seaplane.
3. A ferry can be used to get there.
4. People can use helicopters to visit the island.