Which of the following statements is/are the correct 

To observe an electron, we have to illuminate it with electromagnetic radiations.

For clear location of electron the wavelength of light should be smaller than the dimensions of the electron.

Smaller the wavelength of light used for locating an electron more uncertain will become its energy/velocity due to collision of light of high momentum $\left(\mathrm{p}=\frac{\mathrm{h}}{\mathrm{\lambda }}\right).$

All of these are correct