Which of the following features should be enabled and configured to allow for reliable performance of the VoIP system?

A customer is implementing a VoIP infrastructure using an existing network. The customer
currently has all network devices on the same subnet and would like the phones to be powered
without the use of an AC adapter. Which of the following features should be enabled and
configured to allow for reliable performance of the VoIP system? (Select THREE).

A.
WEP

B.
PoE

C.
VLANs

D.
SSL VPN

E.
IDS

F.
QoS

Explanation:
As customer don’t want to use Ac adapter so Power over Ethernet is best option (PoE) as in this

switch provide power to phones.Phones will transfer their power requirement via cdp to vlan
assigned.And Qos provide the voice packet priority over the data packets to avoid jitter.