opening - In Caro-Kann Defense, what are the differences between 3. Nc3 and 3. Nd2? - Chess Stack Exchange

After 1. e4 c6 2. d4 d5, what are the differences between 3. Nc3 and 3. Nd2? It seems 3. Nc3 is more popular, though after 3. dxe4, I failed to see the difference.

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