Given the Code Snippet Below: Which of the Following

Multiple Choice

Given the code snippet below: Which of the following vulnerability types in the MOST concerning?

A) Only short usernames are supported, which could result in brute forcing of credentials.
B) Buffer overflow in the username parameter could lead to a memory corruption vulnerability.
C) Hardcoded usernames with different code paths taken depend on which user is entered.
D) Format string vulnerability is present for admin users but not for standard users.