Which of the following is causing the reported issue?

A technician is trying to identify the cause of an issue several wireless users are experiencing at an office. The office is in a square-shaped building, with four 802.11b WAPs with omnidirectional antennas located in the four corners of the building. Users near the center of the building report sporadic issues connecting to resources. The technician checks the signal strength in the middle of the building and determines it is adequate .

Which of the following is causing the reported issue?
A . The antenna types are incorrect, and unidirectional should be used.
B . MAC filtering has not been updated.
C . There is channel overlap of the access points.
D . The power levels are set too low on the WAPs.

Answer: C