Thermodynamics Properties of Pure Substances Phase Change of a Pure Substance

Which of the following is true for the given pressure-temperature diagram (phase diagram) for pure substance?  

1
Curve ‘OB’ is sublimation curve. 
2
Point 'B' is critical point. 
3
Point ‘A’ is triple point. 
4
Curve ‘OB’ is vaporisation curve. 
5
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