Temporal Method - Which rate should we use for inventory and fixed assets in the exam

Historical rate at the beginning or the rate specifically given for that type of item. I attempted two EOC questions related to inventory exchange rates and both used different exchange rates. First one was using beginning of period rate and the other was using specific rate when inventory was purchased and this is confusing me.

In the exam which rate should i use for inventory and fixed assets?

Specific rate when inventory was purchased is nothing else than the historical rate. Therefore, I would stick with that rate.