Selah's organization has deployed VoIP phones on the same switches that the desktop PCs are on$.$ What security issue could this create, and what solution would help?

a$)$ VLAN hopping; use physically separate switches.

b$)$ VLAN hopping; use encryption.

c$)$ Caller ID spoofing; MAC filtering.

d$)$ Denial$-$of$-$service attacks; use a firewall between networks.