A 75-year-old man presents with tense bullae as pictured. DIF reveals linear IgG and C3 at the dermal-epidermal junction. On salt-split skin,  immunoreactants are localized to the roof of the specimen. What is the target antigen?

A. Type VII Collagen

B. Type XVII collagen (BP180)

C. Laminin 332

D. Desmoglein 1

E. Integrin α6β4

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