为自己加油

You need to calculate the number of days from 1st January 2019 until today.
Dates are stored in the default format of DD-MON-RR
Which two queries give the required output?

A.SELECT ROUND(SYSDATE-TO DATE('01/JANUARY/2019))FROM DUAL
B.SELECT SYSDATE-TO DATE("01-JANUARY-2019')FROM DUAL;
C.SELECT ROUND(SYSDATE-'01-JAN-2019)FROM DUAL
D.SELECT TO DATE(SYSDATE, DD/MONTH/YYYY")-'01/JANUARY/2019' FROM DUALI
E.SELECT TO CHAR(SYSDATE, DD-MON-YYYY)-'01-JAN-2019' FROM DUAL;