Question: How did the Vigen re cipher improve on the substitution ciphers and make it harder to decrypt a message? Group of answer choices It increased

How did the Vigenre cipher improve on the substitution ciphers and make it harder to decrypt a message?
Group of answer choices
It increased the character set by adding numerals. This increased the number of possible substitutions from 26 to 36.
It increased the character set by adding numerals and uppercase letters. This increased the number of possible substitutions from 26 to 62.
After 26 characters were enciphered it changed the substitution scheme.
After each character was enciphered it changed the substitution scheme.
None of the above

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