Consider a scenario where a store manager maintains a 'list.csv$\text{'}$ file, used to track the remaining

promotional balance for each customer. For this particular campaign, customers have the opportunity to

select three unique items: a computer mouse, a bag, and a study lamp. Importantly, customers may not

choose multiple items from the same category $-$ for instance, purchasing two computer mice is disallowed.

The price ranges for these items vary. A computer mouse can cost anywhere between $$1$ to $$300$; the bag

also ranges from $$1$ to $$300$; and the study lamp is priced between $$1$ to $$400.$ Rest assured, the store

has ample stock to fulfill all orders, and customers are given the flexibility to select one, two, or all three

items as per their preference.

The specifications for the new program, record.py consists of its four main operations:

$$ Add function: This feature permits the manager to integrate a new customer into the system. By

executing the command python record.py add $,$ the manager can input the prices

of the selected items for the new customer. Enter the price of zero if a particular item is not

selected by the customer.

$$ Delete function: This function enables the manager to remove a customer from the system. To

do this, run the command python record.py delete $.$

$$ Update function: This feature provides the manager with the ability to update the expenses of

the items selected by an existing customer. This can be done by running the command python

record.py update $.$ Enter the price of zero if a particular item is not selected by

the customer.

$$ Report function: This function gives the manager the ability to review the profit of promotion

campaign for each customer. By executing the command python record.py report, the manager

can view the expenditure. The expenditure is classified as "Lost" for a certain customer if it falls

within the range of $$800$ to $$1000,$ both inclusive. It is designated as "Low Profit" if it is equal to

or greater than $$500,$ but less than $$800.$ Should the expenditure be less than $$500,$ it is

categorized as "High Profit".

The detailed description for these functions of the program record.py is given in Appendix A$.$

You are required to play the role as a software tester, undertaking the following tasks.