문제 내용: DDC 제23판의 일부를 발췌한 것이다. ㉠, ㉡에 들어갈 Tables
  (보조표)로 옳은 것은?
  Workers by ethnic and national origin
  331.6
  .62 Immigrants and aliens
  .620 9 History, geographic treatment, biography
  Class here immigrant and alien workers in
  specific areas, e.g., immigrant workers in
  Canada 331.620971
  .623-.629 Immigrants and aliens from specific continents,
  countries, localities
  Add to base number 331.62 notation 3-9
  from() for place of origin, e.g., immigrant
  workers from Korea 331.62519
  .63 Native-born workers by ethnic group
  .631-.639 Native-born workers of other ethnic groups
  Add to base number 331.63 notation 1-9
  from(), e.g., Korean Americans 331.63957
선택지 1: Table 2
  Table 5
선택지 2: Table 2
  Table 4
선택지 3: Table 5
  Table 4
선택지 4: Table 5
  Table 2