Which indicates a mix of precipitation that includes ice and freezing rain?

The correct answer is associated with a specific type of winter precipitation known as sleet. Sleet occurs when raindrops freeze into ice pellets before reaching the ground, resulting in a mix of solid and liquid precipitation. This ice formation can create hazardous conditions, as it may cover surfaces like roads and sidewalks, leading to slippery conditions.

In weather reporting, "PL" stands for sleet. This provides a concise indication to pilots and meteorologists about the conditions they can expect, particularly when flying or engaging in other outdoor activities. Recognizing this terminology is crucial for understanding weather impacts on flight operations and safety.

The other choices denote different types of precipitation or weather phenomena. For instance, some refer to rain or various forms of ice but do not specifically denote the mix of freezing rain and sleet as clearly as "PL" does. Understanding these distinctions helps in making informed decisions when planning flight operations under varying environmental conditions.