Which of the following statements is true of American options?

The upper bound on the price of a call option is its intrinsic value.

After expiration, an option on stock will be worth more than the option's intrinsic value.

The lower bound on the price of a call option on stock is the price of the stock.

The lower bound on the price of a call option on stock could be zero.

To prevent arbitrage, the value of the call today must be less than the stock price minus the exercise price.