What is the primary part of the digital camera that contains all the components needed to record the photograph?

(a)  

Which dial on the camera allows you to switch between different shooting modes, such as automatic, manual, or portrait?

(a)  

What is the name of the button that, when pressed, allows you to detach the lens from the camera body?

(a)  

This feature is typically located on top of the camera and is used for mounting an external flash unit or other compatible accessories. What is it called?

(a)  

What is the name of the built-in light source that can be opened or popped up to illuminate subjects in dark conditions?

(a)  

On the Nikon D3100, what is the button called that shows you the photographs already stored on the camera or SD card?

(a)  

What do you look through to compose your shot directly, rather than using the LCD screen?

(a)