<prompt> Base substitution mutations can have the following molecular consequence exceptChanges one codon for an amino acid into another codon for that same amino acidCodon for one amino acid is changed into a codon of another amino acidReading frame changes downstream to the mutant siteCodon for one amino acid is changed into a translation termination codon  <response>: Option a is silent mutation, option b is missense mutation, and option d is nonsense mutation. All three are types of point mutation base substitution mutation. Option c is frame-shift mutation. 