What is defensible space?

What is defensible space?
A . The foundation of CPTED, defensible space is a concept developed by Oscar Newman positing that physical construction of a residential environment that would encourage residents to proactively report all security incidents and events in the local environment
B. The foundation of CPTED, defensible space is a concept developed by Oscar Newman positing that physical construction of a residential environment could elicit behaviour from residents that would contribute significantly to their safety. It directly leads to increased costs associated with security services
C. The foundation of CPTED, defensible space is a concept developed by Oscar Newman positing that physical construction of a residential environment would prevent residents from reporting security incidents or events
D. The foundation of CPTED, defensible space is a concept developed by Oscar Newman positing that physical construction of a residential environment could elicit behaviour from residents that would contribute significantly to their safety. It includes real and symbolic barriers, strongly defined areas of influence, and improved opportunities for surveillance.

Answer: D