Which queries give the correct output?

Examine the structure of the PROMOS table:

You want to generate a report showing promo names and their duration (number of days).
If the PROMO_END_DATE has not been entered, the message ‘ONGOING’ should be displayed. Which queries give the correct output? (Choose all that apply.)
A. SELECT promo_name, TO_CHAR(NVL(promo_end_date -promo_start_date, ‘ONGOING’)) FROM promos;
B. SELECT promo_name, COALESCE(TO_CHAR(promo_end_date – promo_start_date), ‘ONGOING’) FROM promos;
C. SELECT promo_name, NVL(TO_CHAR(promo_end_date -promo_start_date), ‘ONGOING’) FROM promos;
D. SELECT promo_name, DECODE(promo_end_date-promo_start_date, NULL, ‘ONGOING’, promo_end_date – promo_start_date) FROM promos;
E. SELECT promo_name, ecode(coalesce(promo_end_date, promo_start_date), null, ‘ONGOING’, promo_end_date – promo_start_date) FROM promos;

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