Which of the Following Statements About Electronic Article Surveillance (EAS)systems

Which of the following statements about electronic article surveillance (EAS) systems is true?

A) Tags are deactivated when customers try on merchandise
B) Retailers can install the EAS tags more efficiently than vendors
C) It is easy to tell which stores are using EAS systems by the tags found on the store's merchandise
D) EAS systems allow stores to display theft-prone, expensive merchandise outside of glass cases and still have it protected from shoplifters
E) All of these statements about EAS systems are true