Read the following with reference to ocean currents and identify the correct statement/statements.
.A. Winds and density differences are main causes of ocean currents.
B. Sub-tropical North Atlantic gyre movement is anti-clockwise.
C. Zone of warm water between the USA coast and the Gulf stream is called warm wall.
D. The currents in the Northern Indian Ocean change their flow direction four times in a year due to four monsoon seasons.
Choose the correct answer from the options given below: