Boron trifluoride (BF3) has properties ordinarily associated with acids. According to what acid base theory or theories is it considered an acid?

Is it an Arrhenius, Brønstead, Or Lewis Definition? Or is it all?
Thank you very much.

BF3. Can you draw the lewis dot structure for this. Look on the web and google Lewis dot structure BF3.It's close to this.


F:B:F
:F:
wotj extra dots around the F atoms. Note the BF3 does not obey the rule of eight; i.e., it only six electrons around B in BF3. Therefore, two electrons may add at this point.
Which acid/base theory describes the behavior as "an addition of electrons"?
Hint: Arrhenius says acid provides H^+ in solution.
Bronsted-Lowry acid is a proton donor.
BF3 ACCEPTS a pair of electrons from a donor.