Which file should be input as the External DEM file?

I would like to apply External DEM while performing Range Doppler Terrain Correction. I downloaded data from AW3D. The obtained output has the following files (_DSM.tif, _HDR.txt, _LST.txt, _MSK.tif, _QAI.txt, _STK.tif) Which of these files should I use as input for Range Doppler Terrain Correction ?

DSM.tif is the elevation raster required by SNAP.

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