Discussion
What does the field equivalence principle allow?
Answer: C
The equivalence principle states that the field outside a closed surface is unchanged if the sources within are removed and replaced by suitable electric and magnetic surface currents. That is what makes it legitimate to compute a horn's pattern from the field in its mouth, ignoring everything inside. It is a rigorous theorem rather than an approximation. The other options describe engineering substitutions of quite different kinds, none of which follows from any equivalence theorem, and confusing them with it leads to errors of principle.
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