ATPL - Which statement about ST is true?

Question id 312 - General Navigation - ATPL - Airline Transport Pilot license

The standard time at 125° W is UTC - 8h20m

Standard time is the time that is determined by division of the longitude by 15 and rounding off the answer to the nearest integer

In all cases the standard times at Western longitudes are slow on and at Eastern longitudes fast on UTC

Standard time is determined by the government of the appropriate state and does not necessarily follow the borders of 15° wide longitude zones