In Acrobat 6 and 7 Professional, what compression methodology is used with the "Reduce File Size"?

For example, bicubic downsampling to 72 pixels/in.?, to 150 pixels/in.?, to 300 pixels/in.?,
Are all embedded thumbnails also removed?
Are all layers also flattened?

My work around for now is "Make Compatible with…’ from Acrobat 4.0 " which does not support JPEG2000 compression.
http://forums.adobe.com/message/3847176#3847176

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