Final answer:
Irish whiskey is characterized by very little peat flavor, triple distillation in pot stills, and the use of malted and unmalted barley, so the correct answer is all of the above.
Step-by-step explanation:
Irish whiskey is characterized by several distinct features. Firstly, it often has very little flavor derived from peat, unlike some Scotch whiskies which are known for their peaty taste. Secondly, many Irish whiskeys undergo the process of triple distilling in pot stills, which contributes to a smoother finish. Lastly, the utilization of both malted and unmalted barley in the production process is a hallmark of some traditional Irish whiskey styles. Therefore, the correct answer would be (4) All of the above.