Which product must be installed on z/OS to allow a COBOL program running on that machine to access data on a remote DB2 for z/OS server?（）

• A、DB2 for z/OS
• B、DB2 Run-Time Client for z/OS
• C、DB2 Connect Enterprise Edition for z/OS
• D、z/OS Application Connectivity to DB2 for z/OS and OS/390