Generate a correct and concise answer for the question based on the words in the context.

Q: Context : ISO 3166-2:AT is the entry for Austria in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1. 
Question : Who set the standards for ISO 3166-2:AT?

A: International Organization for Standardization
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Q: Context : Nolan Pratt was selected in the 5th round, 115th overall, in the 1993 NHL Entry Draft by the Hartford Whalers from the Portland Winter Hawks of the Western Hockey League. 
Question : What team is Nolan Pratt associated with?

A: Hartford Whalers
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Q: Context : To encourage the adoption of Windows 10, Microsoft announced that during its first year of availability, upgrades to the operating system would be made available free of charge to users of genuine copies of eligible editions of Windows 7, and Windows 8 after update to Windows 8.1. 
Question : The Windows 10 is based upon what?

A:
Windows 8.1
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