26. Which of the following statements is NOT true about phosphorylation? (A) Phosphorylation is a common post-translational modification. (B) Phosphorylation always leads to a change in protein conformation and a decrease in protein charge. (C) Phosphorylation typically involves the addition of a phosphate group to a serine, threonine, or tyrosine residue. (D) Phosphorylation always leads to protein activation.