The graph shows the variation of temperature \( T \) of one kilogram of a material with the heat...

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The graph shows the variation of temperature \( T \) of one kilogram of a material with the heat \( H \) supplied to it. At point \( O \), the substance is in the solid state. From the graph, which of the following statement is correct?
(a) \( T_{2} \) is the melting point of the solid.
(b) \( A B \) represents the change of state from solid to liquid.
(c) \( \left(\mathrm{H}_{2}+\mathrm{H}_{1}\right) \) represents the latent heat of fusion of the substance.
(d) \( \left(H_{3}-H_{1}\right) \) represents the total latent heat of vaporisation of the liquid.
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