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Consider the complex ions, $trans-[Co(en)\left._{2} Cl _{2}\right]^{+}( A )$ and $cis-[Co(en)$ $\left._{2} Cl _{2}\right]^{+}$ $(B).$ The correct statement regarding them is :

• A
  both $( A )$ and $( B )$ can be optically active
• B
  both $( A )$ and $( B )$ cannot be optically active
• C
  $(A)$ can be optically active, but $(B)$ cannot be optically active
• ✓
  $(A)$ cannot be optically active, but $(B)$ can be optically active