Which two data elements should be captured in order to calculate percentage of time spend actively working?

Universal Containers wants to track how much time each Technician is actively working each day.

Which two data elements should be captured in order to calculate percentage of time spend actively working?
A . Technician hours at client location.
B . Technician work orders completed
C . Technician hours traveling
D . Technician hours per day.

Answer: A,D