Phosphoric acid ionizes in three steps with their ionization constant values $K_{a1}$, $K_{a2}$ and $K_{a3}$, respectively, while $K$ is the overall ionization constant. Which of the following statements are true?A. $\log K=\log K_{a1}+\log K_{a2}+\log K_{a3}$ B. ${\text{H}}_3{\text{PO}}_4$ is a stronger acid than ${\text{H}}_2{\text{PO}}_4^{-}$ and ${\text{HPO}}_4^{2-}$ C. $K_{a1}>K_{a2}>K_{a3}$ D. $K_{a1}=\frac{K_{a3}+K_{a2}}{2}$ Choose the correct answer from the options given below:

1. For a polyprotic acid, the overall equilibrium constant $K=K_{a1}\times K_{a2}\times K_{a3}$. Taking logs: $\log K=\log K_{a1}+\log K_{a2}+\log K_{a3}$. Statement A is true.2. Acid strength decreases as protons are removed because it is harder to remove a positive proton from a more negatively charged ion. Thus, ${\text{H}}_3{\text{PO}}_4>{\text{H}}_2{\text{PO}}_4^{-}>{\text{HPO}}_4^{2-}$. Statement B is true.3. Successive ionization constants always decrease: $K_{a1}\gg K_{a2}\gg K_{a3}$. Statement C is true.4. Statement D is incorrect as the constants differ by several orders of magnitude.Statements A, B, and C are true.