Which of the below events takes place in cycles much longer than the time taken by the other two listed below?

Name: Which of the below events takes place in cycles much longer than the time taken by the other two listed below?
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Question

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PDO (Pacific Decadal Oscillation) takes place in cycles much longer than the time taken by Arctic Oscillation (AO) and North Atlantic Oscillation (NAO). While AO and NAO oscillate on a yearly to decadal timescale, PDO oscillates on a timescale of approximately 20-30 years.

Which of the Below Events Takes Place in Cycles Much