Which of the following is the most stable radical? 
Definitions:
Exercise Price
The price at which the holder of an option can buy (in the case of a call option) or sell (in the case of a put option) the underlying security.
Expiration Date
The specific date upon which an options or futures contract is no longer valid and the right to exercise it ceases.
Call Contract
A financial contract giving the buyer the right, but not the obligation, to buy a stock, bond, commodity, or other asset at a specified price within a specified period.
Premium
The amount by which the price of a bond or stock exceeds its principal or par value, or the payment above the risk-free rate made for an insurance policy.
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