Which of the following statements are correct? (i) Copper - berylli...

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Which of the following statements are correct?
(i) Copper - beryllium alloys are used in the preparation of high strength springs
(ii) Metallic beryllium is used for making window X-ray tubes.
(iii) Magnesium powder is used in incendiary bombs and singnals.
(iv) Barium is used in treatment of cancer.
(a) (i), (ii) and (iv)
(b) (i) and (iii)
(c) (i), (ii) and (iii)
(d) (i), (ii), (iii) and (iv)
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