Which letters are used to identify polar regions on the UTM?

The correct identification of polar regions on the Universal Transverse Mercator (UTM) system employs letters A, B, Y, and Z. The UTM is a global map projection system that divides the world into a series of zones, each with its own coordinate system. For regions outside the standard UTM coverage, specifically in the polar areas, these letters are utilized to denote the different zones.

In the case of option B, the letters A and B correspond to specific bands in the northern polar region, while Y and Z are used for the southern polar region. This designation is essential because standard UTM zones do not effectively capture the geometry of the polar areas, necessitating a unique set of identifiers to maintain accurate mapping and navigation in these extreme latitudes.

The other choices do not reflect the standardized nomenclature used for the polar regions within the UTM system, further reinforcing why option B is the correct answer.