The action of blocking time when a physician is unavailable is referred to as setting up an appointment:
plan.
book.
calendar.
matrix

Matrix

Explanation:

The act of blocking time time when a physician is unavailable is known as appointment Matrix. blocking of time requires setting out your most important tasks ahead of time and allotting specific time for that task to be accomplished.

This act of time blocking is carried out regardless of the clock the goal of time blocking is to ensure you achieve the task regardless of how long it will take. like in the case of the unavailability of the doctor at the moment you will need to block time to see the physician because it is a very important task you must achieve. the act of doing this is what we call appointment matrix.

b and c ( ip address and port number)