The managers of a customer support hotline require that all issues be resolved within $72$ hours of initiation $($i$.$e$.$ the resolution time must be less than $72$ hours$).$ To baseline the process, the team decides to control chart process data using an existing database containing the resolution times for each issue. The best chart to use in this application is:

Group of answer choices

a c chart, plotting the number of times each month the hotline fails to meet the $72$ hour requirement.

a p chart, plotting the percent of issues each month that are not resolved within $72$ hours.

an Individual X chart, plotting the resolution time for each issue.

control charts shouldn't be used for this process.