What does the architectural feature known as a 'double dome' signify in Indo-Islamic architecture that developed during the Delhi Sultanate period?

1
Two layers of a dome are used instead of one, which are often in contrasting colors. 
2
Two separate shells were used for the dome: an outer layer for the building's aesthetic appeal and an inner one to provide the ceiling of the interior of the building. 
3
Two domes are built side by side to create a unique architectural feature.
4
Two domes with the same radius are stacked one above the other for providing a distinctive skyline.
5
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