Multiclassing wizard

[Benabik]

What happens when a wizard swaps one of his daily or utility powers via Acolyte or Adept Power? The options I see are:

1. They lose two wizard powers from their spellbook in return for their multiclass power, which they have every day.
2. They lose one wizard power from their spellbook, and add a power which they have every day.
3. They lose one wizard power from their spellbook, and add a multiclass power to their spellbook.
4. They lose two wizard powers from their spellbook, and add two multiclass powers to their spellbook.

My personal guess would be #1, but I could see any of them being true.

Edit: I don't have my books yet, but am trying to figure out how a mystic theurge from my current game would convert to 4th.

 

[spanglemaker]

Try No 2

The Wizard has 2 daily Powers in their spellbook at Level 1. They would lose 1 spell from their spellbook and swap it for a power of their alternate class.