Which of the following species are isoelectronic?
$I. CH_3^+$
$II. NH_2^-$
$III. NH_4^+$
$IV. NH_3$
$I. CH_3^+$
$II. NH_2^-$
$III. NH_4^+$
$IV. NH_3$
- A$I, III, IV$
- B$II, III, IV$
- C$I, II, IV$
- D$II$ and $I$
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