Please mark the only correct statement about options:

a. Being short a put generates a premium for the writer of the put with an unlimited downside potential

b. the payoff of a stock plus a call is identical to the payoff resulting from being long a European put plus a zero-coupon bond (whose face value equals the strike price)

c. the payoff of a stock plus a put is identical to the payoff resulting from being long a European call plus a zero-coupon bond (whose face value equals the strike price)

d. Being short a call generates a premium for the writer of the call with a limited downside potential