What is the Cisco recommended best practice for using data VLANs and voice VLANs?

What is the Cisco recommended best practice for using data VLANs and voice VLANs?

A.
Use the same VLAN ID for both data and voice.

B.
Use one VLAN ID for data and use one VLAN ID for voice.

C.
Use only data VLANs.

D.
Use only voice VLANs.