Which of the following pairs is mismatched?

A)NaOH ⇌ Na⁺ + OH⁻ is a base
B)HF ⇌ H⁺ + F⁻ is an acid
C)MgSO₄ ⇌ Mg²⁺ + $\mathrm { SO } _ { 4 } ^ { 2 - }$ is a salt
D)KH₂PO₄ ⇌ K⁺ + H₂ $\mathrm { PO } _ { 4 }$ is an acid
E)H₂SO₄ ⇌ 2H⁺ + $\mathrm { SO } _ { 4 } ^ { 2 - }$ is an acid