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why is option (d) wrong

in Databases by Active (1.9k points) | 46 views
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Is the ans A ?
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option d is false because there is or operator there

it means there exist a student or there exist d belongs to lib . and somethings after that not of concern here

here if any d belongs to lib. it is always going to accept where that student exist or not and viceversa
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yes answer is A
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If (d) had 'and' in place of 'or' then which one is more suitable (a) or (d) ?

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