Given the NSAP, 39.0100.0102.0001.0c00.1211.00, which portion is interpreted by IS - IS as the area?
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A. 39
B. 39.0100
C. 39.0100.0102
D. 0001
E. 0001.0c00
F. 0001.0c00.1211
参考答案: