Number of the following statements is/are correct?
$\left(\mathrm{A}\right)$ Greater the stability constant of a complex ion, greater is its stability
$\left(\mathrm{B}\right)$ Greater the oxidation state of the central metal ion, greater is the stability of the complex
$\left(\mathrm{C}\right)$ CO stabilizes complex because of its synergic Bonding.
$\left(\mathrm{D}\right)$ Chelate complexes have low stability constants