Which two statements are true about date/time functions in a session where NLS_DATE_FORMAT is set to

A. SYSDATE can be used in expressions only if the default date format is DD-MON-RR

B. CURRENT_TIMESTAMP returns the same date as CURRENT_DATE

C. SYSDATE and CURRENT_DATE return the current date and time set for the operating system of the database server

D. SYSDATE can be queried only from the DUAL table

E. CURRENT_TIMESTAMP returns the same date and time as SYSDATE with additional details of fractional seconds

F. CURRENT_DATE returns the current date and time as per the session time zone