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 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