At high pressure, the following reaction is zero order:

The correct statements among the following is:

(a) Rate of reaction = Rate constant
(b) Rate of the reaction depends on the concentration of ammonia
(c) Rate of decomposition of ammonia will remain constant until ammonia disappears completely
(d) Further increase in pressure will change the rate of reaction
 
1. a, b, and c 2. b, c, and d
3. a, c, and d 4. a, b, and d