Which three characteristics of the traffic flow are taken into consideration when the OoS-for-VPNs feature （OoS pre-classify） provides packet classification and applies appropriate OoS service on tunnel interfaces？ （）

A.a class can be inentified as a single application .multiple applications with similar service nees.or be based on the source or destination ip addresses.
B.a drawback of the diffserv model is that it does not provide backward compatibility with devices that can only use the tos field.
C.diffserv uses the diffserv field in the MAC header to mark frames into behavior aggregates（BAs）
D.the diffserv field occupies the same eight bits of the mac header that were previously used for the tos field.
E.the first six high-order bits of the diffserv field are used to identify the resource reservation protocol（RSVP） value .
F.the primary goal of diffserv is scalabilty.

A. security services
B. TACACS+services
C. Mpls services
D. Routing services
E. Ppp0e services
F. Poe services

A. incoming interface.outgoing interface.ip precedence.and differentiated services code  P.oint（DSCP）.
B. Incoming interace.ip precedence.differentiated services code point（DSCP），and source or d.estination address.
C. Outgoing interface.ip precedence.differentiated services code point（DSCP）.and source or d.estination address.
D. Incoming interface .outgoing interface.ip precedence and differentiated code point s.ervices（DCPS）
E. Incoming interface .ip precedence .and source or destination address. 
F. Outgoing interface.ip precedence .and source or destination address.