Which of the following products did customers buy the most of$?$ Hint: An invoice is a receipt given to a customer at the time of sale listing all of the products included in the sale.

The tree map shows a few product numbers by quantities. Following are the product numbers from the highest count to the lowest count: SKY$-$BAT; SKY$-$PLR; SKY$-$STK; SKY$-$CHG; SKY$-$PRK; SK$2-$CIK; SK$2-$ADP; SK$2-$SPK; MEM$-64$; MEM$-128$; PRK$-$CSE; SK$2-$BEA; SK$2-$CHG; SK$2-$JOY; SK$2-$PRK; SK$2-$USB; blank; SK$2-$STK; MEM$-256$; blank.

Multiple Choice

MEM$-256$

PRK$-$CSE

SK$2-$ADP

SKY$-$BAT