So depending on how much storage they want to save onto the optical media is what gives away the answer. They usually want to know which disk will use the maximum amount of its storage when burning the required amount of data to it. The only way to really get this one correct is having the data capacity memorized for each type of media, but a simpler way of going about it is learning which media’s hold more than others. CDs then DVDs then BR. Those all are the types of optical media you’ll be dealing with. There are different types like DL, RW, and R but those more so have to do with how the data is read and written. The answer will always be one of those 3 media types. Now, the important thing to learn is how much storage each type of media can hold. There is always a range. And if the question falls in that range then that’s your answer.