Conjugate base of \[HPO_{4}^{2-}\] is [MP PMT 1995]

• A. \[PO_{4}^{3-}\]
• B. \[{{H}_{2}}PO_{4}^{-}\]
• C. \[{{H}_{3}}P{{O}_{4}}\]
• D. \[{{H}_{4}}P{{O}_{3}}\]