Carl owns a workshop. He attaches his portable radio to the wall so he can adjust the volume without bending over. Is the radio now a fixture of the workshop?

1. Yes, because the radio would make the workshop more valuable
2. No, because the radio is a chattel and cannot become a fixture
3. Yes. Because the radio was attached to the wall, it is now part of the workshop.
4. Maybe, but only if the radio significantly increased the potential rental value of the property
5. No, because Carl attached the radio for ease of use of it

(Please choose one answer and explain.)