What is component 3 in figure T-1?

توضیح
Component 3 is the lamp in Figure T-1. The resistor and transistor are components 1 and 2, and the ground symbol is component 5, so none of those alternatives identifies component 3.

Component 3 is the lamp in Figure T-1. The resistor and transistor are components 1 and 2, and the ground symbol is component 5, so none of those alternatives identifies component 3.