Expanded protection includes which combination?

• A. Complete protection of all accessible openings; partial protection for interior doors; and a combination of a contact plus an intrusion device or floor mat
• B. Exterior-only protection with no interior sensors
• C. Sound detection only
• D. No monitoring of openings

Answer: (A)

Expanded protection means layering coverage beyond just the outer perimeter by combining different sensor types to guard both openings and interior areas. The described approach does exactly that: it fully protects all accessible openings with sensors on doors and windows, provides partial protection for interior doors to monitor zones inside, and adds a mix of a contact sensor plus an intrusion device or a floor mat to sense entry or movement inside. This combination creates multiple detection points and reduces blind spots, which is the essence of expanded protection.

Other options fall short because they either rely on exterior protection only (no interior sensors), depend on a single type of sensing like sound detection, or completely skip monitoring openings.