This might seem like a stupid question, but I am a new DM and not super familiar with 4E rules and wanted to make sure I understand bonuses and how to effects that relate. I read several other questions on here about bonuses but did not get a clear answer.
As stated in title, if an effect gives a bonus to all defenses, does that include AC? For instance, do effects like Amulet of Protection that give "+1 to all defenses" also give a bonus to AC, or just the other 3 defenses?
Also, what does / doesn't that stack with?
Armor gives "untyped" bonus to AC? Shields give a "Shield" bonus to AC? (thus they do not stack with magical effects that give shield effects right?)