A three-character password is to be created by choosing characters from the digits 0 through 5 inclusive, vowels (a, e, i, o, u), or 5 special keyboard characters. if only one character category can be used at a time, rank the following from smallest to largest based on the number of possibilities for a password.
1. digit, digit, vowel
2. vowel, special character, vowel
3. special character, vowel, digit
a. 1, 3, 2
b. 2, 3, 1
c. 3, 2, 1
d. they are all equal.