A$.$ Create DFD for the following personal trainer scheduling system. Whenever new customers are

seen for the first time, they complete a customer information form that asks for their name,

address, phone number and birthday, which are stored in the customer information file. The system

will also provide them with an account number, which is also stored in the customer information

file. If the customer is a repeat customer, then this step can be skipped. When a customer calls to

schedule a new appointment or change an existing appointment, the receptionist checks the

appointment file for an available time. Once a good time is found for the customer, the

appointment is scheduled. Alternatively, customers can log in online using their account number to

see available time slots, then then can directly sign up for open times. Because appointments are

often made in advance, the system is set up to automatically email a reminder to customers two

days before their appointment.