ARx4 and Blessed Aim

[Tommi]

I'm wondering how the monster's ARx4 bonus interacts with other AR boosting effects, such as Blessed Aim. Is the x4 multiplier effectively a +300% bonus and hence additive with Blessed Aim bonus, or is it a straight multiplier to the base or final AR of the monster?

For example, if a monster gets a +300% bonus from Blessed Aim, does it get an attack rating of:
1. (Base AR x 4) x 4 = Base AR x 16, or
2. Base AR x (1 + 3 + 3) = Base AR x 7 ?

Thanks in advance,

Tommi