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According to the author, how does NASA know ice sheets are shrinking?

1. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost 36 to 60 cubic kilometers of ice per year between 2002 and 2006.
2. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost 150 to 250 cubic kilometers (36 to 60 cubic miles) of ice per year between 2002 and 2006, while Antarctica lost about 36 cubic kilometers of ice between 2002 and 2005.
3. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost 36 to 60 cubic miles of ice per year between 2002 and 2006, while Antarctica lost about 36 cubic miles of ice between 2002 and 2005.
4. None of the above.