Каким способом наиболее лучше добавлять изображения в приложения?

Код AS3:
[Embed(source = "images/active.png")]private const imageButtonActive:Class;//1
[Embed(source = "images/active.png")]private var imageButtonActive:Class;//2
[Embed(source = "images/active.png")]private static const imageButtonActive:Class;//3
[Embed(source = "images/active.png")]private static var imageButtonActive:Class;//4