What is the result of executing a TRUNCATE TABLE command on a table that has Flashback Archiving enabled?

B
https://docs.oracle.com/database/121/ADFNS/adfns_flashback.htm#ADFNS640
http://docs.oracle.com/database/121/SQLRF/statements_10007.htm#SQLRF01707

C is correct
===============
SQL> select * from test;

C1
———-
6
7

SQL> commit;

Commit complete.

SQL> select systimestamp from dual;

SYSTIMESTAMP
—————————————————————————
2015-09-03 16:10:57.660000 +03:00

SQL> select systimestamp from dual;

SYSTIMESTAMP
—————————————————————————
2015-09-03 16:12:32.285000 +03:00

SQL> truncate table test;

Table truncated.

SQL> SELECT * FROM test AS OF TIMESTAMP TO_TIMESTAMP (‘2015-09-03 16:10:57’, ‘YYYY-MM-DD HH24:MI:SS’);

C1
———-
6
7

SQL> select * from test;

no rows selected

SQL> select * from v$version;

BANNER
——————————————————————————–
CON_ID
———-
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 – 64bit Production

Option C is correct.
Ref : I think people have misinterpreted the Oracle doc

https://docs.oracle.com/database/121/ADFNS/adfns_flashback.htm#ADFNS640
Flashback Data Archive supports only these DDL statements:

ALTER TABLE statement that does any of the following:

Adds, drops, renames, or modifies a column
Adds, drops, or renames a constraint
Drops or truncates a partition or subpartition operation
TRUNCATE TABLE statement

RENAME statement that renames a table
………
.
……………..

Tested on 12c:
You cannot roll back a TRUNCATE TABLE statement.

CREATE TABLE employee (EMPNO NUMBER(4), ENAME VARCHAR2(10)) tablespace fda_ts FLASHBACK ARCHIVE fla1;
ALTER TABLE employee FLASHBACK ARCHIVE;
alter session set nls_date_format=’dd/mm/yyyy hh24:mi:ss’;
INSERT INTO EMPLOYEE VALUES (1, ‘pippo’); commit;
select sysdate from dual;
SELECT * FROM employee AS OF TIMESTAMP TO_TIMESTAMP (’16/03/2016 04:26:11′,’dd/mm/yyyy hh24:mi:ss’);
EMPNO ENAME
—– ——
1 pippo
insert into employee values (2, ‘pluto’); commit;
SELECT * FROM employee AS OF TIMESTAMP TO_TIMESTAMP (’16/03/2016 04:26:11′,’dd/mm/yyyy hh24:mi:ss’);
EMPNO ENAME
—– ——
1 pippo
select OWNER, SEGMENT_NAME from dba_segments where TABLESPACE_NAME=’FDA_TS’;
OWNER SEGMENT_NAME
———– ————–
TEST EMPLOYEE

SQL> truncate table EMPLOYEE;
Table truncated.
SQL> SELECT * FROM employee AS OF TIMESTAMP TO_TIMESTAMP (’16/03/2016 04:26:11′,’dd/mm/yyyy hh24:mi:ss’);
*
ERROR at line 1:
ORA-01466: unable to read data – table definition has changed

why I test but succeed?
i.e. C. The rows in the table are archived, and then truncated.

Here is exact syntax I used

conn sys/sys@pdb1 as sysdba

CREATE TABLESPACE fda_ts
DATAFILE ‘E:\ORACLE\data\ORCL\pdb1\fda_ts.dbf’
SIZE 1M AUTOEXTEND ON NEXT 1M;

ALTER USER hr QUOTA UNLIMITED ON fda_ts;

CREATE FLASHBACK ARCHIVE DEFAULT fda_1year TABLESPACE fda_ts
QUOTA 1G RETENTION 1 month;

GRANT FLASHBACK ARCHIVE ON fda_1year TO hr;
GRANT FLASHBACK ARCHIVE ADMINISTER TO hr;
GRANT EXECUTE ON DBMS_FLASHBACK_ARCHIVE TO hr;

GRANT CREATE ANY CONTEXT TO hr;

conn hr/hr@pdb1

create table emp2 as select * from employees;
alter table emp2 flashback archive;

select * from emp2 where rownum some data

select sysdate from dual;

SYSDATE
—————-
2016NOV02 065126

truncate table emp2;

SELECT * FROM emp2 where rownum no rows selected

SELECT * FROM emp2
AS OF TIMESTAMP TO_TIMESTAMP (‘2016NOV02 065126’, ‘YYYYMONDD HH24MISS’)
where rownum some data

Answer = C