Check out the delayed quotes for Amazon options for different exercise prices and maturities. Take the mean of the bid and ask prices.

a. Confirm that higher exercise prices mean lower call prices and higher put prices.

b. Confirm that longer maturity means higher prices for both puts and calls.

c. Choose an Amazon put and call with the same exercise price and maturity. Confirm that put–call parity holds (approximately). You will have to use an up-to-date risk-free interest rate.