Define insurgency, describe a cordon and search operation, and state the primary role of Internal Security (IS).

1. The question asks for the definition of insurgency.

• An insurgency is typically characterized by a non-state group using violence to challenge or overthrow an established government or authority.
• Option A describes a peaceful campaign, which is not an insurgency.
• Option C describes a war between states, which is conventional warfare.
• Option D describes a police action, which is law enforcement.
• Option B accurately captures the essence of an insurgency: a non-state movement using violence against an established authority to achieve political change.

The correct option is B.

$$\boxed{\text{B}}$$

2. The question asks about an operation designed to isolate an area for a systematic search.

• A roadblock operation controls movement on a specific road.
• A crowd dispersal operation aims to break up a gathering of people.
• A patrol base operation involves setting up a temporary base for security forces.
• A cordon and search operation involves surrounding (cordoning off) an area to prevent entry or exit, followed by a systematic search within that isolated area. This matches the description perfectly.

The correct option is C.

$$\boxed{\text{C}}$$

3. The question asks for the primary role of Internal Security (IS).

• Internal Security refers to the maintenance of peace, law, and order within a country's borders.
• Option A (conducting foreign military attacks) is typically the role of external defense forces.
• Option B (training guerrilla fighters) is not a primary role of a state's internal security apparatus.
• Option C (maintenance and restoration of law and order using minimum force) accurately describes the core function of internal security, which is to protect the state and its citizens from internal threats while adhering to legal frameworks and proportionate use of force.

The correct option is C.

$$\boxed{\text{C}}$$