A 62-year-old man with primary sclerosing cholangitis presents with 4 weeks of progressive painless jaundice, pruritus, and weight loss. Bilirubin is 14 mg/dL (direct predominant), ALP 720 U/L, and CA 19-9 880 U/mL. Contrast CT shows dilated intrahepatic ducts with abrupt cut-off at the hepatic hilum, a small enhancing soft-tissue mass at the confluence of right and left hepatic ducts extending into the right secondary branches, right hepatic lobe atrophy, and a collapsed non-distended gallbladder. The lesion marked **B** in the diagram represents this tumor. According to the Bismuth-Corlette classification, what is the type of this hilar cholangiocarcinoma?
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