CC1120: Carrier Sense Threshold Configuration of CC1120 if absolute and relative value?

Hi Team,

We have a customer inquiry regarding the AGC_CS_THR - Carrier Sense Threshold Configuration of CC1120 on page 79  of the document below, if it is an absolute and relative value?
http://www.ti.com/lit/ug/swru295e/swru295e.pdf

Here's the example of the customer below:

Example
If resistor AGC_CS_THR is set 0x04,
which is Carrier Sense Threshold A) or B)?

A) Carrier Sense Threshold = 4dBm.

B) Carrier Sense Threshold = Some defined volue + 4dB
ex. Some defined value = -100dBm
then -100dBm + 4dB = -96dBm

If B) is correct, how much defined value ?

Please let me know if you need more information.

Thanks!

Jonathan