15. Which of the following statements that describes the main function of fuse?
a. Its essential component is a metal wire or strip that melts when too much
current flows through it.
b. It is automatically opens to interupt circuit current in the event of an
overcurrent condition.
c. It protects the user of the appliance from an electrical shock by preventing
any possibility of the external casing becoming live.
d. It provides a path for a fault current to flow to earth.​