The Biba model is a data integrity model that assumes a lattice of integrity levels, where each subject and object has a fixed integrity level. The model enforces two rules: the simple integrity property and the
*-integrity property. The simple integrity property states that a subject can only read an object with an equal or lower integrity level. The *-integrity property states that a subject can only write to an object with an equal or higher integrity level. These rules prevent data corruption from low-integrity sources and unauthorized modification from high-integrity sources. References: Official (ISC)2 CISSP CBK Reference, Fifth Edition, page 316; CISSP For Dummies, 7th Edition, page 113.

The goal of a noninterference model is to strictly separate differing security levels to assure that higher-level actions do not determine what lower-level users can see.
This is in contrast to other security models that control information flows between differing levels of users, By maintaining strict separation of security levels, a noninterference model minimizes leakages that might happen through a covert channel.
The model ensures that any actions that take place at a higher security level do not affect, or interfere with, actions that take place at a lower level.
It is not concerned with the flow of data, but rather with what a subject knows about the state of the system. So if an entity at a higher security level performs an action, it can not change the state for the entity at the lower level.
The model also addresses the inference attack that occurs when some one has access to some type of information and can infer(guess) something that he does not have the clearance level or authority to know.
The following are incorrect answers:
The Bell-LaPadula model is incorrect. The Bell-LaPadula model is concerned only with confidentiality and bases access control decisions on the classfication of objects and the clearences of subjects.
The information flow model is incorrect. The information flow models have a similar framework to the Bell-LaPadula model and control how information may flow between objects based on security classes. Information will be allowed to flow only in accordance with the security policy.
The Clark-Wilson model is incorrect. The Clark-Wilson model is concerned with change control and assuring that all modifications to objects preserve integrity by means of well- formed transactions and usage of an access triple (subjet - interface - object).
References:
CBK, pp 325 - 326
AIO3, pp. 290 - 291
AIOv4 Security Architecture and Design (page 345)
AIOv5 Security Architecture and Design (pages 347 - 348)
https://en.wikibooks.org/wiki/Security_Architecture_and_Design/Security_Models#Noninterf erence_Models

The correct answer is "Discretionary access control". Answers "Mandatory access control" and "Rule-based access control." require strict adherence to labels and clearances. Answer "Sensitivity-based access control." is a made-up distracter.

Explanation/Reference:
Explanation:
Stream ciphers require a lot of randomness and encrypt individual bits at a time. This requires more processing power than block ciphers require, which is why stream ciphers are better suited to be implemented at the hardware level. Because block ciphers do not require as much processing power, they can be easily implemented at the software level.
Incorrect Answers:
B: Block ciphers can be easily implemented at the software level because they do not require as much processing power as stream ciphers.
C: Cipher block chaining is a block encryption method where each block of text, the key, and the value based on the previous block are processed in the algorithm and applied to the next block of text. Cipher block chaining is not more suitable for a hardware implementation.
D: Electronic code book is a block encryption method. It is not more suitable for a hardware implementation.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 791