This language must follow the following rules:

i$.$ A series must start with a prefix character ii$.$ A series must end with a punctuation character

iii. A series can have up to but no more than $7$ characters, excluding prefix and punctuation characters.

iv$.$ A series may not have more small characters than large characters, unless the series has a small character that immediately precedes the final punctuation character

Which one of the following series do not follow all the rules of the language defined above?

axcDDy

eBddx

iDcbey

ibBDy

All of the series follow the language rules