A commander's XO and all of the staff positions the XO supervises are known as
staff.
A)logistical
B)personal
C)coordinating
D)operational

C. Coordinating

Explanation:

The XO  is a common slang for Executive Officer in military's. They're considered as the second-in command of the Commander. In order to delegate their duties, Executive officers supervise a group of people that often referred to as coordinating staff.

The main duty of  Coordinating staffs is mainly to create schedule for the officers,  Arranging rosters that would be deployed and completing all the necessary paperwork related to the operation.