The Rijndael Cipher employs a round transformation that is comprised of three layers of distinct,
invertible transformations. These transformations are also defined as uniform, which means that
every bit of the State is treated the same. Which of the following is NOT one of these layers?

A.
The key inversion layer, which provides confusion through the multiple rounds

B.
The non-linear layer, which is the parallel application of S-boxes that have the optimum worstcase non-linearity properties

C.
The linear mixing layer, which provides a guarantee of the high diffusion of multiple rounds

D.
The key addition layer, which is an Exclusive Or of the Round Key to the intermediate State

Explanation:
This answer is a distracter and does not exist.