The scanning indicator that plots target range and azimuth information in polar coordinates is the:

The plan-position indicator (PPI) is a type of radar display that presents target range and azimuth information in polar coordinates, which is fundamental for effective navigation and target tracking. In this display format, the radar returns are plotted in a circular pattern, with distance from the center representing the range to the target and the angle from a reference point representing the azimuth. This polar coordinate system is particularly advantageous for quickly visualizing the location of multiple targets relative to the radar system, allowing operators to make timely decisions.

In contrast, the other options do not specifically refer to a display that utilizes polar coordinates in the same manner as the PPI. Some may use different types of coordinate systems or display methods, which could obscure the instant comprehension of target bearings and distances that the PPI affords. The clarity and intuitive nature of the PPI format make it a standard in radar operations, particularly in marine and aviation contexts.