Who is right "boss or customer" if u have both persons in front of you asking you for a decision that who is the right what will you do and why?

I will take the2 options into my consideration.

Then i will think which one is the best according to my point of view.

If i find my boss option is the best, so i will apply it.

If not, i will express my point of view for my boss in a professional way.

If my boss neglect my point of view, i will apply his option because he is my boss, and he has more authority.

In addition, i will express my boss option for the Customer, in a polite and friendly manner which maintain customer satisfaction and retention.