Which one of the following is the characteristic climate of the Tropical Savannah Region?

1. The Tropical Savannah Region climate (often classified as 'Aw' in the Köppen classification) is transitional between the equatorial rainforest climate and the hot desert climates. 2. Its most defining characteristic is the alternation between a pronounced wet season during the high-sun period (summer) and a distinct dry season during the low-sun period (winter). 3. Option (A) describes a tropical rainforest climate (Af). 4. Option (B) is characteristic of Mediterranean climates (Cs), which have winter rainfall. 5. Option (C) is incorrect; the dry season in Tropical Savannah regions is usually significant, lasting several months. 6. Option (D) correctly identifies the definite dry and wet season pattern as the key feature of this climate.