**Core Concept:** RPD stands for "Relative Permanent Denudation," which refers to the partial loss of enamel and/or dentin in teeth due to various etiological factors. The classification of RPD levels is crucial for understanding preventive measures and treatment options.

**Why the Correct Answer is Right:** RPD is classified into three levels: primary, secondary, and tertiary prevention. Primary prevention focuses on preventing the initiation of dental caries, such as promoting oral hygiene and fluoride application. Secondary prevention aims to halt the progression of carious lesions once they occur, involving early detection and intervention. Tertiary prevention focuses on managing the consequences of dental caries, like restoring damaged teeth or extracting them when necessary.

**Why Each Wrong Option is Incorrect:**

A. **Option A (Neglective Prevention):** This option is incorrect because neglective prevention is a misinterpretation of primary prevention. It is essential to differentiate between neglective prevention and primary prevention to provide accurate care and guidance to patients.

B. **Option B (Intervention Prevention):** This option is incorrect as well. Intervention prevention is a misnomer and does not represent a valid classification of RPD levels. Primary, secondary, and tertiary prevention are the correct classifications.

C. **Option C (Active Prevention):** Active prevention refers to interventions that directly target the prevention of dental caries, such as fluoride application or sealants. This option is incorrect due to its association with a single aspect of prevention rather than covering the three levels of prevention (primary, secondary, and tertiary).

D. **Option D (Preventive Treatment):** Preventive treatment is another misnomer and does not represent a valid classification of RPD levels. Primary, secondary, and tertiary prevention are the correct classifications.

**Clinical Pearl:** Understanding the correct classification of RPD levels helps healthcare professionals provide appropriate preventive measures and treatments to patients, ensuring effective oral health management. Primary, secondary, and tertiary prevention are essential components of clinical practice to prevent, halt, and manage dental caries, respectively.