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Which of the following compounds is used for water softening ?

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Which of the following compounds is used for water softening ?
(a) Ca3(PO4)2 
(b) Na3PO4            
(c)  Na6P6O18                              
(d) Na2HPO4  

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(c) Na6P6O18
(Sodium hexametaphosphate) commercially known as calgon is used for water softening.
2CaCl2 + Na2[Na4(PO3)6] →Na2[Ca2(PO3)6] + 4NaCl 

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