Please show CLEAR, STEP BY STEP explanations. I've seen similar questions posted on Chegg, but I am posting my question again because the previous answers were not satisfactory. PLEASE DO NOT JUST COPY-PASTE THOSE ANSWERS. I WILL LEAVE A THUMBS DOWN RIGHT AWAY.

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Exercise P8.7. Implement a base class Appointment and derived classes Onetime, Daily, Weekly, and Monthly. An appointment has a description (for example, "see the den- tist") and a date and time. Write a virtual function occurs onCint year, int month, int day) that checks whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a vector of Appointment* with a mixture of appointments. Have the user enter a date and print out all appointments that happen on that date Exercise P8.7. Implement a base class Appointment and derived classes Onetime, Daily, Weekly, and Monthly. An appointment has a description (for example, "see the den- tist") and a date and time. Write a virtual function occurs onCint year, int month, int day) that checks whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a vector of Appointment* with a mixture of appointments. Have the user enter a date and print out all appointments that happen on that date