Consider the following statements regarding Active Galactic Nuclei (AGNs):

1. AGNs are compact regions at the center of galaxies emitting high levels of electromagnetic radiation.

2. AGNs are primarily caused by the accretion of matter by supermassive black holes.

3. All newly detected AGNs were found at very high redshifts, making them extremely distant in cosmic terms.

4. The newly detected AGNs were classified as Seyfert galaxies, a common type of AGN.

How many of the above statements are correct?