Electromagnets are created by (2 points)
A.applying a charge to a magnetic material, wrapped in an insulator, which creates an electromagnetic field around the magnet.
B.covering a magnet with insulation and applying an alternating electrical current to the magnet.
C.twisting a ferromagnetic material, wrapping in an insulator, and applying a direct current to the coil.
D.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.