There are three different categories of earthing (TN, TT and IT) in low voltage distribution systems. What does the first letters represent?

There are three different categories of earthing (TN, TT and IT) in low voltage distribution systems. What does the first letters represent?
A . Indicates the relationship of the power system to the exposed conductive parts of the power receiving system
B . Indicates the power system on the ground
C . Indicates the relationship between neutral N and protective earth PE
D . Indicates power receiving system exposed conductive parts and the relationship between the ground

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Answer: B