Which query gives the correct output?

Examine the data in the PROMO_BEGIN_DATE column of the PROMOTIONS table:
PROMO_BEGIN _DATE
————————————

04-jan-00
10-jan-00
15-dec-99
18-oct-98
22-aug-99
You want to display the number of promotions started in 1999 and 2000.
Which query gives the correct output?

A.
SELECT SUM(DECODE(SUBSTR(promo_begin_date,8),’00’,1,0)) “2000”,
SUM(DECODE(SUBSTR
(promo_begin_date,8),’99’,1,0)) “1999”
FROM promotions;

B.
SELECT SUM(CASE TO_CHAR(promo_begin_date,’yyyy’) WHEN ’99’ THEN 1 ELSE 0 END)
“1999”,SUM(CASE TO_CHAR(promo_begin_date,’yyyy’) WHEN ’00’ THEN 1 ELSE 0 END)
“2000”
FROM promotions;

C.
SELECT COUNT(CASE TO_CHAR(promo_begin_date,’yyyy’) WHEN ’99’ THEN 1 ELSE 0 END)
“1999”, COUNT(CASE TO_CHAR(promo_begin_date,’yyyy’) WHEN ’00’ THEN 1 ELSE 0 END)
“2000” FROM promotions;

D.
SELECT COUNT(DECODE(SUBSTR(TO_CHAR(promo_begin_date,’yyyy’), 8), ‘1999’, 1, 0))
“1999”, COUNT(DECODE(SUBSTR(TO_CHAR(promo_begin_date,’yyyy’), 8),’2000′, 1,
0)) “2000”
FROM promotions;