Which of the following statements are true concerning the creation of magnetic fields? Check all that apply. a. A distribution of electric charges at rest creates a magnetic field at all points in the surrounding region. b. A permanent magnet creates a magnetic field at all points in the surrounding region. c. An electric current in a conductor creates a magnetic field at all points in the surrounding region. d. A moving electric charge creates a magnetic field at all points in the surrounding region. e. A single stationary electric charge creates a magnetic field at all points in the surrounding region.