Which one is buffer solution

Which one is buffer solution

A
$[{PO}_{4}^{-}] [[{HPO}_{4}^{-}]$
B
$[{PO}_{3}^{3 -}] [[H_{2} {PO}_{4}^{-}]$
C
$[{HPO}_{4}^{- -}] [[H_{2} {PO}_{4}^{-}]$
D
All of these

Solution:

[Normal salt + acidic salt] is a buffer solution

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