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Directions \( \quad \) In the following questions a statement of Assertion (A) followed by a statement of Reason \( (\mathrm{R}) \) is given. Choose the correct answer out of the following choices.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are correct; \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \).
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
. Assertion (A) The highest oxidation state of osmium is \( +8 \).
Reason (R) Osmium is a \( 5 d \)-series element.
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