A. BEGIN
1_rec.emp_id :=1;
1_rec.expr_summary := NULL;
1_emp :=emp_typ (1_rec);
IF 1_emp(1).expr_summary IS NULL THEN
DBMS_OUTPUT.PUT_LINE (‘Summary is null’);
END IF;
END;

B. BEGIN
1_rec := NULL;
1_emp := emp_typ (1_rec);
IF 1_emp (1).expr_summary IS EMPTY THEN
DBMS_OUTPUT.PUT_LINE (‘Summary is null’);
END IF;
END;

C. BEGIN
1_emp := emp_typ ();
IF NOT 1_emp. EXISTS (1) THEN
DBMS_OUTPUT.PUT_LINE (‘Summary is null’);
END IF
END;

D. BEGIN
1_rec.emp_id :=1;
1_rec.expr_summary := EMPTY_CLOB ();
1_emp := emp_typ (1_rec);
IF 1_emp(1).expr_summary IS NULL THEN
DBMS_OUTPUT.PUT_LINE (‘Summary is null’);
END IF
END;

E. BEGIN
1_emp. EXTEND;
IF NOT 1_emp. EXISTS (1) THEN
DBMS_OUTPUT.PUT_LINE (‘Summary is null’);
END IF
END;