Unless boss is present employees don't work (i) Boss is present (ii) Boss is not present (iii) Employee work (iv) Employee don't work

(i) and (iv)
(ii) and (iv)
(iv) and (i)
None of these

Correct Answer: (ii) and (iv)

Explanation:

It is the case of "Unless X , Y" the conclusion is:
Boss is not present means employees don't work. [ii and iv]
Employee work means boss is present. [iii and i]

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