What important information is furnished about the nucleus of an atom by the alpha particle scattering experiment of Rutherford?

Important information furnished about nucleus in Rutherford's alpha- particle scattering experiment is:

1) A positively charged particle in an atom is nuleus.

2) According to the information from the experiment nucleus of an atom is very hard and dense.

3) As compared to the size of an atom as a whole nucleus is very small in size.