P-P linkage is present in

Maximum P-O-P linkage present in :-

Consider the following sequence of reactions : The total number of P-O-P linkage present in the compound (Z) is :

A, B, C, and D four compounds. {:('A'-H_(2)Orarr'B'" "2xx'A'-H_(2)Orarr'C'),(C+'O'rarr'D'" "A-'O'rarrH_(3)PO_(3)):} 'O' is oxygen. How many P-O-P linkage are present in hexameric form of compound 'B' ?