Overhead electricity cables are made using steel core aluminium cables. Which statement explains the reason for using these cables?
- AAluminium conducts electricity only when it surrounds a steel core.
- BAluminium conducts electricity and the steel core makes the cable stronger.
- CSteel conducts electricity and is surrounded by aluminium because aluminium is an insulator.
- DSteel conducts electricity and is surrounded by aluminium to stop the steel from corroding.