Based on the information given, it should be noted that plan of Santa Costanza was gotten from being a mausoleum.
A mausoleum simply means a building that houses tombs. The plan of Santa Costanza stems from it being a mausoleum before it was a church.
Therefore, instead of a nave, it has a walkway along the outer edge, known as an ambulatory.
In conclusion, the correct option is a mausoleum.
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