On 11 April 2018, Commonwealth Bank of Australia (CBA) shares were trading at $74.00 while the October 2018 CBA Call and Put options with exercise prices of $80.00 were trading at $0.80 and $5.00, respectively.

Given this information and the fact that the standard option contract size is 100 shares per contract, outline an option arbitrage trading strategy, demonstrate that the strategy is profitable and briefly discuss the effect your arbitrage trading has on your ability to continue to make arbitrage profits.