Radio channels are attractive medium because __________  Can penetrate walls  All of the mentioned  Connectivity can be given to mobile user  Can carry signals for long distance

Radio channels are an attractive medium because they have several advantages:

1. Can penetrate walls: Radio waves have the ability to pass through walls and other physical obstacles, making it possible to receive signals indoors and in other hard-to-reach places.

2. All of the mentioned: This option suggests that all the listed features make radio channels an attractive medium.

3. Connectivity can be given to mobile users: Radio channels can provide connectivity to mobile users, allowing them to receive information and communicate while on the move.

4. Can carry signals for long distances: Radio waves can travel long distances, making it possible to broadcast signals over a wide area.

So, the answer is "All of the mentioned" because all these features make radio channels an attractive medium.