Guess The Answer

My friend has create a puzzle. Then he ask me can I answer it .I don't know the answer and I think it long time so my friend gave me the answer. when I saw the answer, I was shocked.
1269=2
3388=4
9100=3
1111=?
I forgot the question, so I write it myself.
Give you two options:
a)5
b)0
If you think is A, press 👍
If you think the answer is B, press ❤.
Looking forward to your answer.
I will give the correct answer tomorrow(25/2/2021).

we need a pattern, can you give more questions with answers? I have deduced a pattern, but I don't know if it works
@Goh-Kang-Ning-2009

@KOcheckmate

6836=4

then my pattern was wrong :/

@chummer your pattern is correct.

This puzzle does not need to be calculated by a computer, because it is not a math exercise, you just need to look at it only.

Option b

I also think it's 0

Until now, someone has given the right answer?

@Donya1386 yes，but I will not tell you the correct answer.😄