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Runway direction is indicated by two digits; the units are expressed to the nearest 10 degrees of which reference?

the units are expressed in 10° to the nearest 5° of True North

the units are expressed in 10° to the nearest 10° of True North

the units are expressed in 10° to the nearest 5° of the magnetic compass

the units are expressed in 10° to the nearest 10° of the magnetic compass

The direction shown on a runway is based on the magnetic heading of the runway centerline, and that heading is rounded to the nearest 10 degrees. The reference used is the magnetic compass, not true north. That’s why runway numbers correspond to tens of degrees of magnetic heading: for example, a runway with a magnetic heading near 090° is Runway 09, near 270° is Runway 27, and near 360° (or 0°) is Runway 36. This convention keeps runway designations consistent for pilots using magnetic bearings across the globe.