Joe writes a put option for 500 shares of Microsoft stock at $255 prior to July 15, 2021. As a result of this transaction, Joe has: Select one: O a. the option to sell 500 shares of Microsoft stock at any time until July 15, 2021, if this benefits him. O b. the option to buy 500 shares of Microsoft stock at any time until July 15, 2021if this benefits him. O c. the obligation to buy 500 shares of Microsoft stock at any time until July 15, 2021, if the option holder exercises this option. O d. the obligation to sell 500 shares of Microsoft stock at any time until July 15, 2021 if the option holder exercises this option.