A conductor with white insulation may be used as an ungrounded circuit conductor __________. The conductor is contained in a cable.
a. if used for 12-volt door chime system wiring
b. if marked with black tape where visible or accessible and used to connect a 240-V pump motor
c. if marked with red tape where visible or accessible and used for a traveler from a 3-way switch
d. if marked with blue tape where visible or accessible and used to feed the "hot" to a switch
e. all of the above