An App Inventor program is like a recipe. An App Inventor Componenent is like what element of a recipe?
1) An ingredient
2) An instruction
Recipes have ingredients and instructions.
Programs have data and instructions.
Thus, a Component is like an ingredient in a recipe.
An App Inventor Label ...
1) is an example of a Component.
2) shows some text on the phone's screen.
3) has a BackgroundProperty that sets its color.
4) all of the above.