## Discussion Forum

Que. | 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:{1} |