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LM2901: temperature pedigree

Part Number: LM2901

Team, 

My customer has the following question:

Can you tell us why LM2901M (-40°C to 85°C) and LM2901D (-40°C to 125°C) have different specified operating temperatures when Reliability and MTBF tests for LM2901M are conducted at 125°C?  Also, the power rating on the datasheet for LM2901M discusses derating at a junction temperature at 125°C.  Should LM2901M not be operating at temperatures above 85°C?  

Regards,

Aaron