Which of the following particles are subatomic particles? 1. Electron 2. Proton 3. Neutron 4. Muon Select the correct answer using the code given below.

Subatomic particles include all particles smaller than an atom. Electrons, protons and neutrons are the well-known constituents of atoms. Muons are elementary subatomic particles (leptons) similar to electrons but about 207 times heavier, produced in cosmic ray showers. All four therefore are subatomic particles.