At foor , door and business

Hi Alan and Torsten,

A is knocking the door of B’s house.

A: May I speak to someone in the household under the ages of 20?
B: At door / Door / Business / General ineligible.

At door, door, business and general ineligible are three different answers. Could you tell me what they mean? Thank you so much.

Waxgourd

Is that a question from a test?

Sorry Waxgourd. Those answers are unintelligible.