What mechanisms do modern operating systems implement to enhance security and protect against malicious attacks, and how do these mechanisms function?Group of answer choices• (a) Modern operating systems use fixed memory allocation and static user permissions to enhance security by simplifying system management.• (d) Modern operating systems use legacy security models that emphasize physical isolation and hardware-based protection.• (c) Modern operating systems rely solely on antivirus software and firewalls to protect against malicious attacks, focusing on external threat prevention.• (b) Modern operating systems enhance security through mechanisms such as address space layout randomization (ASLR), data execution prevention (DEP), and user access controls. ASLR randomizes memory addresses to prevent predictable attacks, DEP prevents execution of code in non-executable memory regions, and access controls manage user permissions.• (e) Modern operating systems enhance security by integrating biometric authentication and eliminating traditional password-based access controls.

(a) Modern operating systems do not typically use fixed memory allocation and static user permissions to enhance security. This approach does not provide the flexibility and robustness needed to protect against the variety of threats that exist today.

(d) While some modern operating systems may incorporate elements of legacy security models, they also implement more advanced security mechanisms. Physical isolation and hardware-based protection alone are not sufficient to protect against the sophisticated attacks that can be launched against modern systems.

(c) Modern operating systems do not rely solely on antivirus software and firewalls for protection. While these are important components of a comprehensive security strategy, they are complemented by other mechanisms implemented at the operating system level.

(b) This is the most accurate statement. Modern operating systems enhance security through mechanisms such as address space layout randomization (ASLR), data execution prevention (DEP), and user access controls. ASLR randomizes the location of data in memory to make it more difficult for an attacker to predict where to find it. DEP prevents code from being executed in areas of memory that are not designated for that purpose, which can help to prevent certain types of attacks. User access controls ensure that only authorized users can access certain resources or perform certain actions.

(e) While some modern operating systems do incorporate biometric authentication, this is not typically used as a replacement for traditional password-based access controls. Instead, it is often used in conjunction with passwords to provide an additional layer of security.