How is variable visibility encoded in a METAR report?

In a METAR report, variable visibility is indeed conveyed in the remarks section, typically indicated as "VIS" followed by a numerical value that represents the varying visibility. For instance, "VIS 1V3" denotes visibility that varies between one and three statute miles. This allows meteorologists and aviation professionals to quickly understand that visibility is not constant but instead fluctuates, which is crucial information for flight operations and safety.

The other options do not accurately reflect how variable visibility is documented in METAR reports. The body of the report and standard visibility terms usually provide fixed visibility values, while a separate code is not used for variable visibility, and addressing variable visibility specifically within the remarks section allows for clarity and precise communication of changing conditions.