Please answer the following question: Answer the following question given this paragraph: There are also six types of leptons, including electrons. Leptons have an electric charge of either -1 or 0. Electrons, for example, have a charge of -1. Leptons have mass, although the mass of electrons is extremely small. Q: How many types of leptons are there? Choices: - nine - two - twelve - six A:
A:
six