A major solar storm reaching the Earth can potentially cause which of the following effects?

1. Disruption of GPS signals

2. Tsunamis in equatorial coastal regions

3. Damage to electrical power grids

4. Intense auroral displays at high latitudes

5. Disturbance in the orbits of satellites

6. Planet-wide forest fires

7. Radio blackouts over polar regions

Select the correct answer using the code given below.