Consider the clustered bar chart of the dashboard developed to monitor the performance of a call center:

A clustered bar chart with a horizontal axis labeled "Number of Calls" with $3$ groups of bars is given. Each group consists of $3$ individual bars. A description of the groups of bars is as follows. The group labels are given first, followed by each of the labels for the individual bars and their respective approximate heights.

Houston: Email: $8,$ Internet: $7,$ Software: $6$

Dallas: Email: $8,$ Internet: $9,$ Software: $14$

Austin: Email: $23,$ Internet: $8,$ Software: $4$

This chart allows the IT manager to do which of the following?

identify the percent of customers who do not have one of the listed problems

identify the frequency of a particular type of problem by location

identify how often a problem is related to hardware

identify which city contains the most customers