Which of the following was observed by Rutherford in his $\mathrm{\alpha }$-ray scattering experiment?

Most of the $\mathrm{\alpha }$-particles passed through the gold leaf undeviated

A small fraction of $\mathrm{\alpha }$-particles was deflected by small angles 

Out of about 20,000 $\mathrm{\alpha }$-particles only one $\mathrm{\alpha }$-particle faced a complete rebound, i.e., deflection at ${180}^{\mathrm{o}}$

All of the above