Which of the following statements is true for the reaction below?
HF(aq) +HPO₄²⁻(aq) ⟵⟶F-(aq) + H₂PO⁴⁻ (aq)
A. HF is the base.
B. HPO₄²⁻ is the acid.
C. F⁻ is the conjugate base.
D. H₂PO₄⁻is the conjugate base.