The diagram shows two electric circuits, P and Q.

P

Q

Which of the following are correct about circuit P and circuit Q?

1. The bulbs in circuit P are dimmer than the bulbs in circuit Q.
2. Circuit P is a parallel circuit while circuit Q is a series circuit.
3. All the components are arranged parallel to each other in circuit P while all the components are arranged in a single line in circuit Q.
4. Circuit P lets the electric current flow along two paths while circuit Q lets the electric current flow along one path only.