Which SQL statements are valid?

See the Exhibit and examine the structure of the PROMOSTIONS table:
Exhibit:


Which SQL statements are valid? (Choose all that apply.)
A. SELECT promo_id, DECODE(NVL(promo_cost,0), promo_cost,promo_cost * 0.25, 100) "Discount"FROM promotions;
B. SELECT promo_id, DECODE(promo_cost, 10000,DECODE(promo_category, ‘G1’, promo_cost *.25, NULL),NULL) "Catcost"FROM promotions;
C. SELECT promo_id, DECODE(NULLIF(promo_cost, 10000),NULL, promo_cost*.25, ‘N/A’) "Catcost"FROM promotions;
D. SELECT promo_id, DECODE(promo_cost, >10000, ‘High’,<10000, ‘Low’) "Range"FROM promotions;

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