Has my Mercedes-Benz A-Class got a chain cam?

Has a 2007 Mercedes-Benz A-Class A150 Elegance SE automatic got a timing chain or timing belt and, if a belt, when is the recommended interval for changing?
All Mercedes-Benz cars, from Maybachs down to Smarts, had always been chain cam until they announced that the lowest emission 2012 model A-Class would be fitted with a belt cam 1.4-litre Renault diesel engine. That will probably need changing every six years or 60,000 miles.
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