A.信用證業(yè)務(wù)和提貨擔(dān)保業(yè)務(wù)均需占用客戶(hù)授信額度 B.僅信用證業(yè)務(wù)需占用客戶(hù)授信額度 C.僅提貨擔(dān)保業(yè)務(wù)占用客戶(hù)授信額度 D.以上說(shuō)法都不對(duì)