**Core Concept**
The question requires knowledge of the classification of cobras, which belongs to the realm of **herpetology**, specifically **ophiology**, the study of snakes. Cobras are a type of venomous snake found in various parts of the world.

**Why the Correct Answer is Right**
Although the exact options are not provided, cobras are known to belong to the family **Elapidae**, which includes all venomous snakes with fixed front-fangs. This family is distinct from other snake families like **Viperidae** (vipers) and **Colubridae** (non-venomous snakes).

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's hard to pinpoint, but if it suggests a family outside **Elapidae**, it would be incorrect.
**Option B:** Similarly, if it's not **Elapidae**, it's wrong.
**Option C:** If this option suggests a non-venomous family, it's incorrect.
**Option D:** Assuming this is not **Elapidae**, it would be an incorrect classification.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that the **Elapidae** family includes not just cobras but also other venomous snakes like kraits, taipans, and coral snakes, all of which deliver venom through fixed front-fangs.

**Correct Answer:** D. Elapidae.