Use the following information to answer questions 2-5

The following table summarizes activity and related information under our stock option plans. All option grants presented in the table had exercise prices not less than the fair value of the underlying common stock on the grant date: Weighted Average Weighted Average Shares Exercise Price Remaining Contractual Term Aggregate Intrinsic (in thousands) (in dollars) ( Years) Value (in millions) Outstanding at December 31, 2015 27,413 28.56 Granted 2.927 82.78 Forfeited (244) $ 87.86 Expired (42) $ 92.39 Exercised (6,897) 18,46 Outstanding at December 31, 2016 23.157 37.69 4.05 5 864 Exercisable at December 31, 2016 19.264 28.16 3.07 S 860 Expected to vest, net of estimated forfeitures at December 31, 2016 3,660 84.88 8.85 5 3