Which of the following statements is CORRECT?

a. Call options generally sell at a price greater than their exercise value, and the greater the exercise value, the higher the premium on the option is likely to be.

b. Call options generally sell at a price below their exercise value, and the greater the exercise value, the lower the premium on the option is likely to be.

c. Call options generally sell at a price below their exercise value, and the lower the exercise value, the lower the premium on the option is likely to be.

d. Because of the put-call parity relationship, under equilibrium conditions a put option on a stock must sell at exactly the same price as a call option on the stock.

e. If the underlying stock does not pay a dividend, it does not make good economic sense to exercise a call option prior to its expiration date, even if this would yield an immediate profit.