4 The International Patent Classification, commonly referred to as the IPC, is a ＿＿＿＿＿＿system in which the whole
area of technology is divided into a range of sections, classes, subclasses and groups. There are eight sections
that are broken down into classes and subclasses. Choose the one that best completes the above sentence:
(A)analogical domical (B) hierarchical (C) vortical (D)
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