Which one is an eample of primary research?

Question

1. asking a refernce librarian for specific sources of information
2. Calling a dietician for info about a low-card diet
3. Searching the internet for nutrious recipes
4. Reading an interview in a professional journal

I am not really sure

Answer 1

number four because it has no data that has been already taken.

Answer 2

tahnks that helps :)