What Are the Main Benefits of Digital Display Panels

What are the main benefits of digital display panels?

A) Only the advertiser can change the display, allowing them to change ads based on performance.
B) They are an inexpensive and flexible medium that can help transit systems in emergencies and entertain passengers.
C) Their ability to eliminate selective perception makes their high costs worthwhile, and they finance themselves.
D) The transit authority can monitor passengers for criminal behavior, passengers are safer, and they finance themselves through advertising.
E) By identifying passengers through facial recognition, ads can be customized to individual's tastes.