What is the average protected period?
{"CEO": {"Protected Period": 2.0, "Multiple of Annual Cash Compensation": 3.0, "Years of Welfare Benefits": 3.0}, "Other Executives": {"Protected Period": 1.5, "Multiple of Annual Cash Compensation": 2.0, "Years of Welfare Benefits": 2.0}, "Other Officers": {"Protected Period": 1.0, "Multiple of Annual Cash Compensation": 1.0, "Years of Welfare Benefits": 1.0}}
protected_period = ( df["CEO"]["Protected Period"] + df["Other Executives"]["Protected Period"] + df["Other Officers"]["Protected Period"] ) / df["CEO"]["Multiple of Annual Cash Compensation"]
answer = protected_period