Which one of the following is not contained in Portland cement? [NDA]

• A. \[C{{a}_{3}}A{{l}_{3}}{{O}_{6}}\]         
• B.          \[C{{a}_{3}}Si{{O}_{5}}\]
• C. \[C{{a}_{2}}Si{{O}_{4}}\]           
• D.          \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\]