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Q. The inclusion of sets into R = {{1, 2}, {1, 2, 3}, {1, 3, 5}, {1, 2, 4}, {1, 2, 3, 4, 5}} is necessary and sufficient to make R a complete lattice under the partial order defined by set containment.

  • (A) {1}, {2, 4}
  • (B) {1}, {1, 2, 3}
  • (C) {1}
  • (D) {1}, {1, 3}, {1, 2, 3, 4}, {1, 2, 3, 5}

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