Which, if any, of these statements are true? (More than one may be true.) Explain. Assume the

Question:

Which, if any, of these statements are true? (More than one may be true.) Explain. Assume the batteries are ideal.
a. A battery supplies the energy to a circuit.
b. A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same.
c. A battery is a source of current; the current leaving the battery is always the same.