One of players has an Oracle with the Familiar Master archetype, including the Familiar Conduit feat.
If both Oracle and familiar have a non-Heightened Invisibility cast on them and the Oracle uses an offensive spell through the familiar on an opponent -- who becomes revealed? Is it...
a) The familiar, which the offensive spell is originating from against the opponent?
b) The Oracle, because she is using her actions to cast the spell, not the familiar.
c) Both.
From Invisibility: "If the target uses a hostile action, the spell ends after that hostile action is completed."
From Familiar Conduit: "Under your tutelage, your familiar has grown attuned to the hidden currents of the world and can serve as a conduit for your magic. If the next action you use is to Cast a Spell that has a range, the spell uses the familiar as its origin point."
I'm interested in both RAW and RAI, if you see them as different.