[ANSWERED]Random bonuses of store items

Well, I had a question about purchasing items with random bonuses at warmane store, for example: https://wotlk.evowow.com/?item=45994
Can I choose the bonuses (of the invoker, of the soldier, of the marksman,...), or are randomly generated?
I posted that issue here, cause it's something important to know before purchasing and i want to know it safely.

Thanks!

I believe they are random as mentioned.