A Strongpoint is a:

• A. A mobile supply point.
• B. An unprotected open area.
• C. A temporary camp site.
• D. A fortified position designed to defend a sector.

Answer: (D)

A strongpoint is a fortified position built to defend a specific sector of terrain. It concentrates weapons, troops, and protective cover to deny the enemy's ability to push through that area, provides clear fields of fire, and allows the defenders to observe and respond to threats within the sector. It’s designed to absorb and slow an attack, sustain itself with prepared firing positions and obstacles, and maintain control of key approaches so neighboring positions can operate with coordinated fire and movement.

The other options describe something that isn’t a defensible, sector-focused position: a mobile supply point is about moving and resupplying assets, not holding ground; an unprotected open area offers no protection or fighting positions; a temporary camp site is for living quarters and logistics rather than permanent defense.