What was the difference between outstanding options that were exercisable and vested and expected to vest?
{"Exercisable": {"Outstanding Options": 945.0, "Exercise Price": 47.24, "Weighted- Average Remaining Contractual Term (in years)": 3.81, "Aggregate Intrinsic Value(1)": 95.0}, "Vested and expected to vest": {"Outstanding Options": 2589.0, "Exercise Price": 56.13, "Weighted- Average Remaining Contractual Term (in years)": 6.41, "Aggregate Intrinsic Value(1)": 238.0}}
vested_and_expected_to_vest = df["Vested and expected to vest"]["Outstanding Options"]
exercisable = df["Exercisable"]["Outstanding Options"]
answer = vested_and_expected_to_vest - exercisable