How Do the Redundant Properties of the Genetic Code Protect

How do the redundant properties of the genetic code protect humans from some mutations (changes in the gene sequence) ?

A) Some mutations will not change the amino acid coded by the anticodon of the mRNA.
B) Some mutations will not change the tRNA anticodon.
C) Some mutations will not change the amino acid coded by the mRNA codon.
D) Different side chains on amino acids will not affect protein folding.
E) tRNA anticodons will only be altered and the resulting protein will remain unchanged.