Final answer:
The statement that there may be new database users or web app users after a security breach of your server is true.
Therefore, the correct answer is: option a) true.
Step-by-step explanation:
A data breach is a security violation, in which sensitive, protected or confidential data is copied, transmitted, viewed, stolen, altered or used by an individual unauthorized to do so.
Hackers obtaining unauthorized access can lead to new users, exemplified by incidents like the Target and iCloud breaches.
Data breaches can result in compromised security, leading to unauthorized access to databases and web applications by new users, which can include the attackers themselves using stolen credentials or by creating new user accounts.
These breaches can have severe consequences, such as those seen in high-profile cases like the Target data breach in 2013 or the 2014 iCloud breach that leaked private photos.