Pick out the wrong statement about distillation operation

• A. Distillation under vacuum is a substitute for steam distillation.
• B. In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation.
• C. In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other.
• D. Flash distillation, differential distillation & steam distillation are all continuous distillation processes.