At what layer of the osi model do the 802.11 standards vary?

Question

Problem:

Can anyone help it was actually asked in exam as following and I need to know whether my answer was right or not?

At what layer of the OSI model do the 802.11 standards vary?
A) Physical layer
B) Network layer
C) Data link layer
D) Transport layer

Answer 1

As per my experience and knowledge 

The correct answer is: ​Physical layer

As Physical layer is responsible for putting bits 'on the air.'
  
Hope this might help you.

Answer 2

The Correct answer of this question is A) Physical Layer