The structure of a peptide is given below

If the absolute values of the net charge of the peptide at $pH =2, pH =6$, and $pH =11$ are $\left| z _1\right|,\left| z _2\right|$ and $\left|z_3\right|$, respectively, then what is $\left|z_1\right|+\left|z_2\right|+\left|z_3\right|$ ?

  • A$3$
  • B$2$
  • C$4$
  • D$5$
IIT 2020, Difficult
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