How many possible variations of substitution ciphers are there with the Standard English alphabet? You can base your calculations on the assumption that the plain text alphabet and the cipher alphabet will be lower case English characters only.

A. 1

B. 26

C. 676 (this is 26x26)

D. ~403000000000000000000000000 (this is 26!)

E. There are an infinite number of possible variations.

F. None of the above