10.下列對於BGP(Border Gateway Protocol)的敘述，何者正確？ (A)它是 inter-autonomous system routing protocol，使用 link state routing (B)它是 inter-autonomous system routing protocol，使用 path vector routing (C)它是 intra-autonomous system routing protocol，使用 link state routing (D)它是 intra-autonomous system routing protocol，使用 path vector routing