A bar magnet is a piece of permanently magnetised ferromagnetic material, while a current-carrying solenoid is a coil of wire wound in closely spaced turns that produces a magnetic field only when an electric current flows through it (i.e., it is an electromagnet). Despite being physically very different, they share several important similarities in their magnetic behaviour, which is why the solenoid is often used as a model or substitute for a bar magnet in physics demonstrations.

Let us examine each statement:

• Statement 1 (Both have North and South poles): True. In a bar magnet, the poles are fixed physical ends of the material. In a solenoid, the two ends of the coil behave exactly like magnetic poles — the end where field lines emerge behaves as a North pole, and the end where they enter behaves as a South pole. The polarity of the solenoid can be determined using the right-hand (or right-hand grip) rule based on the direction of current flow.
• Statement 2 (Both produce a nearly uniform magnetic field inside): True. Inside a bar magnet, and inside a long solenoid (away from the ends), the magnetic field lines run parallel to the axis and are evenly spaced, indicating a field of nearly constant magnitude and direction — this is why solenoids are used in laboratories and instruments whenever a uniform magnetic field is required over a region of space.
• Statement 3 (Both require permanent magnetic material only): False. This is the key point that distinguishes the two: a bar magnet's magnetism is intrinsic and permanent, arising from the aligned magnetic domains of a ferromagnetic material (like iron, cobalt, or certain alloys). A solenoid, on the other hand, requires no permanent magnetic material at all — it can be made of ordinary copper wire, and it produces a magnetic field purely because of the moving charge (electric current) through the coil. Its magnetism disappears the moment the current is switched off, unlike a permanent magnet.
• Statement 4 (Both follow the right-hand rule for determining the direction of the magnetic field): This is also considered valid in the context of this comparison — the direction of the magnetic field of a solenoid is found using the right-hand (grip) rule based on current direction, and the equivalent pole structure of a bar magnet (once its poles are known) follows the same field-direction conventions used across electromagnetism for consistency.

Taking statements 1, 2, and 4 together as valid similarities (and correctly excluding statement 3, since permanent magnetic material is unique to the bar magnet and not a requirement for the solenoid), the combination of statements 1, 2, and 4 describes the genuine similarities between the two, which corresponds to the correct selection among the given combinations.