You Must Provide the Best Coverage Possible for Users Inside

You must provide the best coverage possible for users inside an office. The office is free from tall obstructions such as shelving, but has a high ceiling. You have decided to use a low-gain Omni-directional antenna to achieve your goal. Where should you install the antenna for best coverage?

A) In the center of the building on the roof.
B) In the center of the building on the ceiling.
C) In one of the corners of the building.
D) On one of the walls of the building.