Which of the following is correct regarding the Standard Time zone?
1. It is calculated as the angular distance from the Greenwich meridian.
2. Indian Standard time is 5.5 hours ahead of Greenwich Meridian Time.
3. A country can have multiple Standard Time Zone.
1. 1 and 2 only
2. 2 and 3 only
3. 1, 2 and 3
4. 3 only