A.
In a SQL Trace log file, you should look for queries with low duration values and high read and write values.
B.
In a query execution plan, you should look for queries with missing or out-of-date statistics.
C.
In a SQL Trace log file, you should look for queries with high duration values and low read and write values.
D.
In a query execution plan, you should look for queries with a large number of table scans.