Sam reads the newspaper. He drinks coffee.

I have joined the sentences as follows? Which are the correct ones? "While" is the word provided.

1. While drinking coffee, Sam reads the newspaper.
2. While reading the newspaper, Sam drinks coffee.
3. While Sam is reading the newspaper, he drinks coffee.
4. While Sam is drinking coffee, he reads the newspaper.

I think all the sentences are correct. Am I right?

Thanks.