Which of the following statements is correct?

  • A
    Freon-$14$ is $CF_4$,Freon-$13$ is $CF_3Cl$,Freon-$12$ is $CF_2Cl_2$,and Freon-$11$ is $CFCl_3$.
  • B
    Freons are chlorofluorocarbons.
  • C
    Freons are used in refrigerators.
  • D
    All of the above.

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