Which Statements Are TRUE for Gran Plots

Which statements are TRUE for Gran plots?
I Gran plots are more accurate around end point than first and second derivative plots.
II The end point is determined using concentration/pH data prior to the end point.
III For a constant slope,where the Gran plot crosses the x-axis is the end point volume.
IV Gran plots are used with polyprotic titration curves as well as monoprotic titration curves.

A) I,II,and IV
B) II,III,and IV
C) I,II,and III
D) I,II,III,and IV
E) I,III,and IV

Correct Answer:

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