$\begin{array}{r}\begin{array}{r}{\mathrm{NaH}}_2{\mathrm{PO}}_4\stackrel{ }{\stackrel{>{240}^{\circ }\mathrm{C}}{\to }}{\left({\mathrm{NaPO}}_3\right)}_3\stackrel{ }{\stackrel{{625}^{\circ }\mathrm{C}}{\to }}{\mathrm{NaPO}}_3\\ \text{ (Liquid melt) }\\ \begin{array}{rl}\downarrow & \text{ Rapid }\\ \left(\mathrm{X}\right)& \text{ cooling }\end{array}\end{array} \end{array}$

Find the number of correct statements about (X)?

(a) $X$ is cyclic hexametaphosphate (${\mathrm{Na}}_6{\mathrm{P}}_6{\mathrm{O}}_{18}$),

(b) $X$ is widely used for softening water. 

(c) $X$ is long chain linear polyphosphate.

(d) $X$ is soluble in water. 

(e) $X$ is known as cyclic calgon. 

(f) $X$ is Graham salt.