what is the difference in transmit power between an AP operating at Tx Power Level 1 and the same AP

In general, what is the difference in transmit power between an AP operating at Tx Power Level 1
and the same AP operating at Tx Power Level 3?

A.
2 dB

B.
3 dB

C.
6 dB

D.
11 dB

E.
17 dB