Which is the correct match for the complex and the number of chelate rings formed?
Complex $-$ No. of Rings

  • A
    $[Co(ox)_2Cl_2]^{3-}$ $-$ $2$
  • B
    $[Ni(dmg)_2]$ $-$ $2$
  • C
    $[Ca(EDTA)]^{2-}$ $-$ $5$
  • D
    Brown ring complex $-$ $0$

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