What is the convention patter between 30 S and 30 N latitude ?

O cooler air rises and moves toward the equator, then warms and falls and moves away from equator.

O hotter air rises and moves toward the equator, then cools and falls and moves away from the equator.

O cooler air rises and moves away from the equator, then warms and falls and moves back to the equator.

O hotter air rises and moves away from the equator, then cools and falls and moves back to the equator.