Keeping a secure username and password cannot provide complete security to computer systems. The correct option to this question is b i.e false.
Keeping secure username and password do not guarranty to provide complete security to your computer system. However, secure username and password offer the first line of defense against unauthorized access to computers. Because no matter how secure a username and password is, it can be stolen and ha-cked.
With the advancement in ha-cking techniques, secure username and password can be easily stolen. However, keeping a secure username and having a strong password gives you some edge of protection but it does not provide you complete protection from unauthorized access. Your computer username and password can be easily accessible by ha-ckers via BIOS attack or other techniques.
However, in web-based applications, or in mobile apps you should enable two-factor authentication while keeping a secure username and password from the security perspective.
You can learn more about how to keep secure password at
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