SDO_NN and SDO_WITHIN_DISTANCE return distance on way or on straight line?

Hi to all,
I want ask you if the distance between 2 points computed with SDO_NN and SDO_WITHIN_DISTANCE is a distance on the way that connects these two points (for example 35 miles) or is a distance on a straight line that connects these two points (for example 20 miles)?
thank you very much.

Ok Jack, thank you.
I understood. For straight line I mean a distance that doesn't pass for the streets but on the earth without considering the streets (distance as the crow flies).
Do you confirm that this result is a distance as the crow flies?
Thank you very much.

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