Match List I with List II.
| List I $($ Complex) | List II (Oxidation number of metal) |
| A. $\mathrm{Ni}(\mathrm{CO})_4$ | I. +1 |
| B. $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+}$ | II. Zero |
| C. $\left[\mathrm{Co}(\mathrm{CO})_5\right]^{2-}$ | III. -1 |
| D. $\left[\mathrm{Cr}_2(\mathrm{CO})_{10}\right]^{2-}$ | IV. -2 |
Choose the correct answer from the options given below:
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