Students are completing a table about a particular subatomic particle that helps make up an atom. The students have filled in one cell of the table so far. A 3-column table with 2 rows. The first row has entries Mass (a m u), location, charge. The second row has entries 1, nothing, nothing.

Based on the information shown, which statement about the subatomic particle must be correct?
Its location is in the nucleus, because the particle is a proton or a neutron.
Its location is in the nucleus, because the particle is a neutron or an electron.
Its charge is +1, because the particle is a proton.
Its charge is 0, because the particle is a neutron.