An office supply store carries an inventory of 1,345 different product

An office supply store carries an inventory of 1,345 different products, all of which it categorizes as business use, personal use, or both. There are 740 products categorized as business use only and 520 products categorized as both business use and personal use. What is the number of products characterized as personal use ?

A. 520
B. 605
C. 740
D. 1260
E. 1345