Which of the following is true concerning a global transaction?

• The required data are at one local site and the distributed DBMS routes requests as necessary.
• The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
• The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
• The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.