What does the "Available Fields" on the Kibana Discover page list?

What does the "Available Fields" on the Kibana Discover page list?
A . The fields with data elements in the current index
B . The fields within the log records that can be searched.
C . The fields within the log records that can be aggregated.
D . The fields within the log records that are common to all of the log records

View Answer

Answer: A