**Core Concept**
Inherited coagulation defects can be classified into three main categories based on the type of T coagulation (thrombin) involved: Protein C deficiency, Protein S deficiency, and Antithrombin III deficiency. These defects lead to an imbalance in the regulation of coagulation, resulting in an increased risk of thrombosis.

**Why the Correct Answer is Right**
Protein C deficiency is a rare inherited disorder characterized by a deficiency of the Protein C protein, which is an anticoagulant protein that regulates blood clotting by inactivating Factors V and VIII. This deficiency leads to an increased risk of thrombosis. Protein S deficiency is another inherited disorder caused by a deficiency of the Protein S protein, which is a cofactor for Protein C in the inactivation of Factors V and VIII. This deficiency also increases the risk of thrombosis. Antithrombin III deficiency is a rare inherited disorder caused by a deficiency of the Antithrombin III protein, which is a natural anticoagulant that inhibits thrombin and other coagulation factors. This deficiency leads to an increased risk of thrombosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Protein C deficiency is a specific inherited coagulation defect, not a category of defects.
**Option B:** Protein S deficiency is another specific inherited coagulation defect, not a category of defects.
**Option C:** Antithrombin III deficiency is a specific inherited coagulation defect, not a category of defects.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that inherited coagulation defects can be categorized into three main groups: Protein C deficiency, Protein S deficiency, and Antithrombin III deficiency. These defects are often associated with an increased risk of thrombosis and can be diagnosed through laboratory tests.

**✓ Correct Answer: D. All**