oracle ocp 19c考题，科目082考试题-date/time functions

4.Which two statements are true about date/time functions in a session where NLS_DATE_FORMAT is set to DD-MON-YYYY HH24:MI:SS? (Choose two.)A. CURRENT_TIMESTAMP returns the same date and time as SYSDATE with additional details of fractional secondsB. SYSDATE can be queried only from the DUAL tableC. CURRENT_DATE returns the current date and time as per the session time zoneD. SYSDATE can be used in expressions only if the default date format is DD-MON-RRE. SYSDATE and CURRENT_DATE return the current date and time set for the operating system of the database serverF. CURRENT_TIMESTAMP returns the same date as CURRENT_DATESource:cuug