【单选题】
A Identify a revision to an illustration with A Mack horizontal line in the left margin opposite the revised portion or use a "pointinghand"
B Identify a revision to an illustration with A Mack vertical line in the left margin opposite the revised portion or use a "pointinghand"
C Identify a revision to an illustration with A Mack longitudinal line in the left margin opposite the revised portion or use a"pointinghand"
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