Answer: Medium of exchange and measure of value
Explanation: Medium of exchange refers to the ability of the money to be taken as a common medium for exchange of goods and services in the form of sale and purchase.
Whereas, measure of value refers to the ability by which different goods and services could be compared in terms of money.
In the given case, Laura purchased a CD using money and also is comparing two commodities in terms of money to purchase.
Hence we can conclude that the given case illustrates Medium of exchange and measure of value .