Which detail of the Porta Marzia (Gate of Mars) may be termed the most Etrusco-Roman, as opposed to Greek?

Name: Which detail of the Porta Marzia (Gate of Mars) may be termed the most Etrusco-Roman, as opposed to Greek?
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The arch is the most Etrusco-Roman detail, as it was a significant architectural feature developed and used extensively by the Romans, derived from earlier Etruscan architecture, distinguishing it from Greek architectural practices that favored post-and-lintel constructions.

Which Detail of the Porta Marzia (Gate of Mars) May