Explanation:

Both statements are correct regarding seismic waves :

• P-waves (Primary waves): These are the first waves to be detected by a seismograph during an earthquake. They travel the fastest and can move through solids, liquids, and gases. This is why they are recorded earlier than S waves on a seismograph.
• S-waves (Secondary waves): These waves come after P-waves and move slower than P-waves. They can only travel through solids. The movement of particles in S-waves is perpendicular to the direction of wave propagation, giving them a shearing, side-to-side motion. On the other hand, the particles in P-waves move back and forth in the direction of wave propagation.
• Hence, the correct answer is "Both 1 and 2".