You are a help desk technician providing support for a wireless network. A user calls and complains that he cannot access the Internet. The user tells you he has good signal strength, but the network connection states "Acquiring network address" and the IP address is all zeros. What could cause this problem?

A There is an incorrect WPA passphrase on the client device.

B The client has an $802\mathrm{.}11$a network ad$$pter$.$

C The client device has a static IP address.

D A computer virus has infected the client device.