Final answer:
The correct statement is that the magnet is a permanent magnet and the nails are only temporary magnets if they have been affected by the magnet's field and have not undergone a permanent magnetization process.
Step-by-step explanation:
From the descriptions provided, we can understand that magnets exhibit both attraction and repulsion based on the orientation of their poles. Magnets can attract certain metals such as iron and nickel but cannot attract non-metals like plastic or wood.
The option that states both the magnet and the nails are permanent magnets cannot be true unless it's specifically mentioned that the nails have been magnetized in a permanent way (e.g., by being placed in a strong magnetic field). Typically, nails become temporary magnets when they are near a permanent magnet, as their atoms align to create a magnetic field, but this magnetism usually fades after the external magnetic field is removed. Hence, the correct answer is that the magnet is a permanent magnet, and unless the nails are specified to have been made permanent by a specific process, they are temporary magnets when influenced by the magnet's field.