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Consider the following statements:

1. Ocean currents are the slow-surface movements of water in the ocean.

2. Ocean currents assist in maintaining the Earth's heat balance.

3. Ocean currents are set in motion primarily by prevailing winds.

4. Ocean currents are affected by the configuration of the ocean.

Which of these statements are correct?

A)  1 and 2 only    

B)  2, 3 and 4 only

C)  1, 3 and 4 only             

D)  1, 2, 3 and 4