What should come in place of the question mark (?) in the given series based on the English alphabetical order?

ZZZ, CCC, FFF, III,  ?

​ZZZ, CCC, FFF, III,  ?

Logic: Each next term increases by +3 in alphabetical position:

First Letter: Z+3 →C, C+3 → F, F+3 → I, I+3 → L

Second Letter: Z+3 →C, C+3 → F, F+3 → I, I+3 → L

Third Letter: Z+3 →C, C+3 → F, F+3 → I, I+3 → L

So, the next term is: LLL

Thus, the correct option is: (d)