Which of the following is/are Dobereiners triad? P (a) \( \mathrm{P}, \mathrm{As}, \mathrm{Sb} \...

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Which of the following is/are Dobereiners triad?
P
(a) \( \mathrm{P}, \mathrm{As}, \mathrm{Sb} \)
(b) \( \mathrm{Cu}, \mathrm{Ag}, \mathrm{Au} \)
W
(c) \( \mathrm{Cl}, \mathrm{Br}, \mathrm{I} \)
(d) \( \mathrm{S}, \mathrm{Se}, \mathrm{Te} \)

Correct answer is
(1) a and b
(2) b and c
(3) a, c and d
(4) All
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