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. 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, 2021if the option holder exercises this option.