Answer:
The rate is used to apply overhead at the end of the accounting period.
Step-by-step explanation:
The formula to compute the predetermined overhead rate is shown below:
= Estimated manufacturing overhead cost รท estimated activity
So for this the estimates should be used, the rate should be prepared after the starting. IF there is a single allocation basis so it would not suceed to allocate for all the production departments also this rate would helpful for the managers with respect to keep up to date estimates
Therefore the last option is correct