Problem 3.1. A European call option on a stock with a strike price of $60 and expiring in six months is trading at $10. A European put option on the stock with the same strike price and expiration as the call option is trading at $4. The current stock price is $66 and a $1 dividend is expected in three months. Zero coupon risk-free bonds with face value of $100 and maturing after 3 months and 6 months are trading at $99 and $98, respectively.

Identify the arbitrage opportunity open to a trader.