Choose the data technology $($Q$,$ H$,$ U$,$ or S$)$ that is most appropriate for each of the following business questions$/$scenarios and briefly explain your reasoning.

Q $$ Database Querying

H $$ Statistical Hypothesis Testing

U $$ Unsupervised Data Mining

S $$ Supervised Data Mining

A$)$ I want to know which of my current customers have spent the most money on my products over the last six months.