The finance department for an online shopping website has discovered that a number of customers were able
to purchase goods and services without any payments. Further analysis conducted by the security
investigations team indicated that the website allowed customers to update a payment amount for shipping. A
specially crafted value could be entered and cause a roll over, resulting in the shipping cost being subtracted
from the balance and in some instances resulted in a negative balance. As a result, the system processed the
negative balance as zero dollars. Which of the following BEST describes the application issue?

A.
Race condition

B.
Click-jacking

C.
Integer overflow

D.
Use after free

E.
SQL injection