El Nino-Southern Oscillation (ENSO) Cycle

Consider the following statements:

  1. El Nino and La Nina are opposite phases of what is known as the El Nino-Southern Oscillation (ENSO) cycle.
  2. La Nina is sometimes referred to as the warm phase of ENSO and El Nino as the cold phase of ENSO.
  3. Typically, El Nino occurs more frequently than La Nina.

Which of the statement(s) given above is/are correct? Choose the correct answer from the codes given below:

A
1 and 2
B
2 and 3
C
1 and 3
D
1, 2 and 3
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