Which of the following is an example of environmental design for security purposes?

Extra lighting is an important aspect of environmental design for security purposes because it enhances visibility around a property or building, thereby deterring potential criminal activity. Well-lit areas are less appealing to intruders, as they facilitate observation and increase the risk of detection. Lighting can also enhance safety for occupants by providing safer pathways and reducing the fear associated with dark or poorly lit areas.

The other options may contribute to security in various ways, such as increased signage aiding navigational safety, smaller windows providing less access for potential intruders, and fewer entrances potentially limiting access points. However, these features do not directly impact the deterrence of crime and enhancement of safety in the same immediate and recognizable manner as strategic lighting does.