In which of the following cases, the value of impact parameter (for alpha particle scattering experiment by Geiger-Marsden) will be minimum ?

head on collision of $α$-particle with nucleus $α$-particle goes undeviated $α$-particle suffers large scattering $α$-particle suffers small scattering

head on collision of $α$-particle with nucleus

The correct answer is Option (1) → head on collision of $α$-particle with nucleus