bang for your buck

[vartan]

Noob question: In game description, must it say Effective Against Armour to be considered AP or can a unit have AP even if description does not state Effective Against Armour?

EDIT: And if it must state so, then is that statement for the Primary weapon's AP attribute? (i.e. if secondary is AP but not primary weapon, then would it not state Effective Against Armour even though the secondary has AP?) Sorry if questions are unclear.