Look at the four schematic symbols shown in the figure above. Each of the symbols is labeled with a number. Which of the following statements about these symbols is correct?

A. Symbol 1 represents a wire connection, symbol 2 represents a battery, symbol 3 represents a variable resistor, and symbol 4 represents a fuse.
B. Symbol 1 represents a fuse, symbol 2 represents a fixed resistor, symbol 3 represents a battery, and symbol 4 represents an SPST switch.
C. Symbol 1 represents a fixed resistor, symbol 2 represents a fuse, symbol 3 represents a relay coil, and symbol 4 represents a lightbulb.
D. Symbol 1 represents a battery, symbol 2 represents a lightbulb, symbol 3 represents a fuse, and symbol 4 represents a relay coil.