In Total, How Long Can the Lags Associated with Discretionary

In total, how long can the lags associated with discretionary policy extend?  

A)  from the time a problem occurs in the economy through to the time the problem is recognized by the government 
B)  from the time a problem is recognized by the government through to the time an agreed-on policy is approved 
C)  from the time a policy is implemented through to the time the policy's impact is felt in the economy 
D)  from the time a problem occurs in the economy through to the time a corrective policy has an impact on the economy