**Core Concept**
The liver is divided into segments based on its vascular and biliary anatomy, allowing for precise surgical resection and minimally invasive procedures.

**Why the Correct Answer is Right**
The liver is classified into segments using the Couinaud classification, which divides the liver into eight segments (I to VIII) based on the distribution of the hepatic veins and portal veins. Each segment has a unique blood supply and drainage, allowing for targeted surgical resection and minimizing damage to surrounding liver tissue. This classification is crucial in liver surgery, transplantation, and interventional radiology.

**Why Each Wrong Option is Incorrect**
**Option A:** The Rappaport classification is used to describe the liver lobule, but it does not divide the liver into functional segments.
**Option B:** The liver does not have a clear division into lobes, unlike the lungs or brain, so a lobar classification is not applicable.
**Option C:** The liver is not divided into segments based on its surface anatomy, such as the gallbladder bed or ligaments.

**Clinical Pearl / High-Yield Fact**
The Couinaud classification is essential in liver surgery, as it allows for precise resection of liver tumors and minimizes the risk of liver failure. Familiarity with this classification is crucial for surgeons, radiologists, and hepatologists.

**Correct Answer: C. The Couinaud classification is used to divide the liver into segments.**