You are a networking consultant brought in to troubleshoot a problem that is happening on a company's wireless LAN. The company exists in a strip mall with many other companies in close proximity. The problem that occurs is that connectivity is intermittent at different times throughout the day. What is MOST likely causing the problem?

a. Physical structural properties of the building are causing signal problems
b. Signal strength is too low
c. Channel interference from other companies' wireless LANs
d. The wrong wireless LAN protocol is being used