A hacker arrives early and sits in the lobby of a commercial building to wait on someone who works there. He uses a laptop and successfully captures and reads data from a wireless network. Which of the following best describes a potential vulnerability the attacker exploited? Select two.

a$.$ The wireless network was open.

b$.$ Someone may have set up a rogue AP$.$

c$.$ The AP was not using MAC address filtering.

d$.$ The access point may have been configured.