Q. 57 The inclusion of which of the following sets into
S ={{1, 2},{1,2,3},{1,3,5},{1,2,4},{1,2,3,4,5}}
is necessary and sufficient to make
S a complete lattice under the partial order defined by set containment?
(A) {1}
(B) {1},{2,3}
(C) {1},{1,3}
(D) {1},{1,3},{1,2,3,4},{1,2,3,5}
Answer: (A)
Explanation:
