You have just setup a wireless network and are having problems getting the signal to reach through the entire building. Right now, the AP is located in the western end of the building. The access point's frequency meets the requirements to cover the whole building. Which of the following is MOST likely the reason why you are unable to get the signal throughout the building?

A$.$ Incorrect WAP placement

B$.$ Encryption selected

C$.$ Incorrect channel selection

D$.$ Frequency mismatch