What new capability of the Zumwalt class significantly reduces its radar cross section?

The Zumwalt class destroyers are designed with advanced stealth technology that significantly reduces their radar cross section. This technology involves the ship's shape, materials used in construction, and surface coating, all aimed at minimizing radar detection. A reduction in radar cross section means that the ship is much harder for enemy radar systems to detect and track, providing a tactical advantage in warfare.

The design features, such as the angular hull and superstructure, are specifically engineered to deflect radar waves away from their source, contributing to this stealth capability. This aspect is vital for modern naval operations, allowing the Zumwalt class to operate with greater anonymity and increase its survivability in hostile environments.

The other options such as advanced propulsion systems, increased speed and agility, and enhanced armament capabilities relate to different aspects of ship performance and operational effectiveness. While they are important for overall mission capabilities, they do not specifically address the stealth characteristics that reduce radar visibility, which is a defining feature of the Zumwalt class.