Which of the following statements is correct?
- AFreon-$14$ is $CF_4$,Freon-$13$ is $CF_3Cl$,Freon-$12$ is $CF_2Cl_2$,and Freon-$11$ is $CFCl_3$.
- BFreons are chlorofluorocarbons.
- CFreons are used in refrigerators.
- DAll of the above.
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