What is mean by koeppean classification?

The Köppen-Geiger system uses colors and shades to classify the world into five climate zones based on criteria like temperature, which allows for different vegetation growth. The Köppen climate classification system categorizes climate zones throughout the world based on local vegetation.

The Köppen climate classification divides climates into five main climate groups, with each group being divided based on seasonal precipitation and temperature patterns. The five main groups are :

A. (tropical),

B. (dry),

C. (temperate),

D. (continental), and

E. (polar).

Each group and subgroup is represented by a letter.

Köppen's classification identifies six C climates and eight D climates:

what are the options?