Consider the following statements related to protein sorting and targeting to cell organelles:

1. Signal recognition particle (SRP) is essential for the targeting of specific proteins to the endoplasmic reticulum (ER).
2. Proteins destined for the nucleus are transported through nuclear pore complexes, and their sorting relies on a short amino acid sequence known as a nuclear localization signal (NLS).
3. Mitochondrial proteins are synthesized with a mitochondrial targeting sequence that is recognized by receptors on the mitochondrial surface.
4. Proteins bound for the peroxisome typically contain a peroxisomal targeting signal (PTS1), which is recognized by the cytosolic receptor Pex5p.
Based on the above statements, which of the following options is correct?