An international corporation develops a systems software product used by many enterprises to run their applications. Although the enterprises are constantly upgrading their underlying hardware, the company's strategy is to keep their application$-$facing interface unchanged despite the hardware changes. What is the impact of such a strategy?

It prevents enterprises from upgrading their hardware.

It allows enterprises to keep using the same applications even if underlying hardware keeps changing.

It requires full re$-$training of all users to use the new applications.

It forces an application upgrade with each hardware upgrade.