Answer:
a. Summary reports
Explanation:
Summary reports -
It is a form of tabular report , which consists of rows and column of data , is referred to as summary report .
It acts as a source for the components of dashboard .
As summary report enables to create a chart , view subtotal etc .
The subtotal value can be viewed from this type of report for a particular field , in order to generate a hierarchical list .
Hence , from the given scenario of the question ,
The correct answer is summary reports .