Final answer:
The subject of this question is Business. The query requests specific information about customer purchases, specifically the list of unique customer's last and first names with the product names of customers who have purchased boots priced $10 and under.
Step-by-step explanation:
The subject of this question is Business as it pertains to retrieving and analyzing customer information related to purchases. The query requests specific information about customer purchases, specifically the list of unique customer's last and first names with the product names of customers who have purchased boots priced $10 and under. This type of analysis is often done by businesses to understand their customers' buying habits and to make informed marketing decisions.