When a repeating timer expires,（）.

A.The When-Timer-Expired trigger resets the timer's iteration parameter. 
B.The When-Custom-Item-Event trigger fires and executes the desired actions. 
C.It is put in a queue of expired timers for processing on a first-in-first-out basis. 
D.The When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.