Action and Knowledge in Mīmāṃsā

In the same book discussed earlier today, Ram-Prasad writes that "the subordination of knowledge to action in Mīmāṃsā is expressed through two claims:
1. Knowledge informs and motivates action; and
2. it is action which takes the person to the highest good."
I wonder whether there is not a third claim (explicit, at least in Someśvara):
3. knowledge is a sort of action. Hence, it is not an alternative to it.