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According to Indian Boiler Regulations the essential requirement of any safety valve is that

[A].	It should have good appearance	[B].	It should be located outside the boiler room
[C].	It should be costly	[D].	It should be visible to boiler operator from all positions in the boiler room
[E].	Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure

Answer: Option E