Which options are the right descriptions of the International product life cycle?

A、Stage 1: a company creates a new product to satisfy a market need. This generally takes place in a developed country.;
B、Stage 2: sales in other developed countries start to grow, and local competitors see that there are enough customers to justify production of products that imitate the original product. Alternative processes or patents are developed. ;
C、Stage 3: the manufacturing process has become much better known and almost routine.;
D、 A product will be manufactured in different countries over its life cycle.