Why do aspartic acid and glutamic acid have a net charge of + 1 at low pH and -2 charge at high pH? Select the single best answer. O Both amino acids have two COOH groups. At low pH values, both are protonated, along with the - NH; group. At high pH values, bo are protonated, leading to a -2 charge overall. O Both amino acids have two COOH groups. At high pH values, both are protonated, along with the - NH; group. At low pH values, bo are deprotonated, leading to a -2 charge overall. O Both amino acids have two COOH groups. At low pH values, one is protonated, along with the - NH3 group. At high pH values, one i deprotonated, leading to a -2 charge overall