Final answer:
The statement pertains to updating and maintaining accurate data within a calendar system or appointment scheduling software, by replacing and removing old appointment details with the new ones.
Step-by-step explanation:
The statement “When an appointment is rescheduled, the first appointment date and time must be removed” relates to the management of calendar or scheduling data within a software application or system. This process typically involves accessing a calendar system, selecting the specified appointment, and performing an update operation where the original appointment details are replaced by the new date and time. After doing so, the old appointment must be removed to avoid confusion and maintain an accurate schedule. This concept is fundamental in the development and operation of appointment scheduling software.