Question: What is the minimum size grounding electrode conductor required for a 4 0 0 - ampere feeder supplying a panelboard installed in a structure if

What is the minimum size grounding electrode conductor required for a 400-ampere feeder supplying a panelboard installed in a structure if the size of the largest ungrounded conductor of the feeder is 600 kcmil aluminum and the grounding electrode is a metal in-ground support structure (building steel)?
a.6 AWG copper
b.4 AWG aluminum
c.1/0 AWG copper
d.3/0 AWG copper
What is the minimum size grounding electrode

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