You would use vous, since M. Bernard means Mr. Bernard, and is formal. Generally if you're addressing someone as "Mme." "M." or "Mlle.", it's formal.
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the answer is:
d. it is transferred by radiation and convection.
Answer:
indirect: me, te , lui, nous, vous, leur
direct: me, te, le, la, nous, vous, les
Explanation:
