The stability constants for complexes formed by a metal ion $(M^{2+})$ with ligands $NH_3$,$CN^-$,$H_2O$,and $en$ are $10^{11}$,$10^{27}$,$10^{15}$,and $10^8$ respectively. Based on these values,which of the following is correct?
- A$en$ is a strong ligand.
- B$CN^-$ is a strong ligand.
- CThe strength of the ligand has no relation to the given values.
- DAll ligands are equally strong.
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