在MME选择PGW的方式中，HSS上针对该UE必须配置PGWIP或PGWFQDN,否则MME无法找到提供服务的PGW（）

A.IMSI

B.GUTI

C.TAI

D.APN

A.UE上报

B.从源侧MME获取

C.从HSS获取

D.从MME本地配置获取

A.UE—EUTRAN—MME–SGW/PGW

B.UE—EUTRAN–SGW/PGW—MME

C.UE—SGW/PGW-EUTRAN—MME

D.UE—EUTRAN–SGW/PGW

A.MME

B.HSS

C.SGW

D.PGW

A.HSS

B.MME

C.SGW

D.PGW

A.MME

B.SGW

C.PGW

D.HSS

A.MME

B.SGW

C.PGW

D.HSS

A.MME

B.SGW

C.HSS

D.PGW

A.SGW

B.HSS

C.PGW

D.E-UTRAN

A.SGW

B.MME

C.PGW

D.HSS