I'd go with option D - if your app takes off, you'll be making enough money to buy the "proper" domain. That, or use a random word generator to create a brand n

I'd go with option D - if your app takes off, you'll be making enough money to buy the "proper" domain. That, or use a random word generator to create a brand name. Protip: if you go down this road, do a Google first just in case it means something unexpected :)