I need a coffee shop big enough for my entourage

Which of these methods would be the best way to prevent someone from “shoulder surfing” when you’re working on your laptop?

A) Dim the brightness to the lowest level

B) Adjust the display font feature to the smallest value

C) Attach a filter to the front of your display screen

D) Use an external display instead of the built-in LCD screen

E) Hire a “screen bodyguard” named Bruno to keep eyes off your laptop