A symmetric algorithm must have certain characteristics to be considered strong. Which of the following is correct pertaining to these types of characteristics?

A.
Confusion is carried out through transposition, and diffusion is carried out through diffusion.

B.
Confusion is carried out through substitution, and diffusion is carried out through transposition.

C.
Confusion and diffusion are both used to increase the work factor.

D.
The randomness of the cryptoperiod and functions in the algorithm correlate with the level of confusion and diffusion that is provided.

Explanation:
Confusion is commonly carried out through substitution and diffusion
is carried out by using transposition. For a cipher to be considered strong it must
contain both of these attributes, to ensure that reverse engineering is basically
impossible. The randomness of the key values and the complexity of the mathematical
functions dictate the level of confusion and diffusion that is involved.