A、Form_A has updates or deletes that have not been posted or committed, and Form_A invokes Form_B with the OPEN_FORM built-in.  B、Form_A has updates or deletes that have not been posted or committed, and Form_A invokes Form_B with the CALL_FORM built-in.  C、Form_A has inserts that have not been posted or committed, and Form_A invokes Form_B with the OPEN_FORM built-in.  D、Form_A has inserts that have not been posted or committed, and Form_A invokes Form_B with the CALL_FORM built in.