Explanation:

Let's analyze the statements:

- Electrons:

Not found in the core of the atom. They orbit around the nucleus.

- Protons:

Found in the core (nucleus) of the atom.

- Neutrons:

Also found in the core (nucleus) of the atom.

- Positrons:

Not found in the core of a normal atom. Positrons are antimatter counterparts of electrons and are not present in a typical atomic nucleus.

Options:

1. 1 only – Incorrect, electrons are not in the core.

2. 2 only – Incorrect, as neutrons are also in the core.

3. Both 1 and 2 – Incorrect, for reasons above.

4. All – Incorrect, not all are found in the core.

Correct Answer: Option 2 (protons only) and option 3 (protons and neutrons).

But the best fit for the question is that the core (nucleus) contains protons and neutrons.