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 diode, symbol 2 represents a resistor, symbol 3 represents an led, and symbol 4 represents a transistor.
b. symbol 1 represents a diode, symbol 2 represents an led, symbol 3 represents a transistor, and symbol 4 represents a resistor.
c. symbol 1 represents a transistor, symbol 2 represents a resistor, symbol 3 represents an led, and symbol 4 represents a diode.
d. symbol 1 represents a transistor, symbol 2 represents a diode, symbol 3 represents a resistor, and symbol 4 represents an led.