A customer asks you a question and you are not sure of the answer. You feel the customer expects you to know..?

i would like to choose the 3rd & 4th option since you will not make the customers offended and the 3rd option shows that you like finding out things while the 4th option shows that you like asking people about things you do not know. You can confess to them that you don't understand/know the answer & use the 3rd/4th option so that customers will not feel so offended with your attitude.