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Correct Option is Both (a) and(c)

The number of time zones a country practices mostly depends on the size of the country .For example, it’s impossible for a country as huge as Russia with an area of 17.1 million km² to function on only one time zone –this might create a problem of day-night difference within the same country .So, Russia has 11 time zones and USA has 6 time zones. However, there are certain exceptions like China which functions on only one time zone despite its size. Indian Standard Time is calculated on the basis of 82.58° E longitude and its uniform across the country.

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