A Splunk Architect Has Inherited the Splunk Deployment at Buttercup

A Splunk architect has inherited the Splunk deployment at Buttercup Games and end users are complaining that the events are inconsistently formatted for a web sourcetype. Further investigation reveals that not all web logs flow through the same infrastructure: some of the data goes through heavy forwarders and some of the forwarders are managed by another department. Which of the following items might be the cause for this issue?

A) The search head may have different configurations than the indexers.
B) The data inputs are not properly configured across all the forwarders.
C) The indexers may have different configurations than the heavy forwarders.
D) The forwarders managed by the other department are an older version than the rest.