Assuming that the pKa for the N-terminal amino group is 8 and the pKa for the C-terminal carboxyl group is 3.5, what is the net charge of the following peptide at pH 11.5? Peptide= TRAGLKMES

Multiple choice answers provided:

a) -2

b) -1

c) 0

d) +1

e) +2

please provide a step by step answer as to which is the correct answer