Which of the following is/are always true? (W) (a) Every irrational number is a surd. (b) Any su...

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Which of the following is/are always true?
(W)
(a) Every irrational number is a surd.
(b) Any surd of the form \( \sqrt[n]{a}+\sqrt[n]{b} \) can be rationalized by a surd of the form \( \sqrt[n]{a}-\sqrt[n]{b} \), where \( \sqrt[n]{a} \) and \( \sqrt[n]{b} \) are surds.
(c) Both (a) and (b)
(d) Neither (a) nor (b)
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