Which substance is used in refrigerators instead of $CFCs$ and is less harmful to the environment?
- A$1,1,1,2-$ Tetrafluoroethane $(HFC-134a)$
- B$1,1,1,2-$ Tetrafluoromethane $(HCF-134a)$
- C$1,1,2-$ Trichloroethane $(HFC-132b)$
- D$1,2,1,2-$ Tetrafluoropropane $(HCF-132b)$
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