第29题: [单项选择]下列哪个命令用于给用户定义“Operator Determined Barring of All Outgoing Calls”这种业务?() A. HGSDC://MSISDN=8613901234567,SUD=OBA-1; B. HGSDC://MSISDN=8613901234567,SUD=OBO-1; C. HGSDC://MSISDN=8613901234567,SUD=OBI-1; D. HGSDC://MSISDN=8613901234567,SUD=OBO-2; 参考答案:B