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Which of the following is correct for critical temperature

A)                 It is the highest temperature at which liquid and vapour can coexist

B)                 Beyond the critical temperature, there is no distinction between the two phases and a gas cannot be liquefied by compression

C)                 At critical temperature \[({{T}_{c}})\] the surface tension of the system is zero

D)                 At critical temperature the gas and the liquid phases have different critical densities