A data steward is responsible for managing and overseeing the organization's data assets, ensuring the data is accurate, accessible, secure, and used effectively. One of the key responsibilities of a data steward is to ensure that data decisions and impacts are communicated to the organization. This includes helping stakeholders understand the importance of data quality, the implications of data decisions, and how changes in data management affect the organization.
Data stewards serve as a bridge between data users, business units, and IT teams, ensuring that the organization's data-related policies, guidelines, and decisions are clearly communicated and understood.

B1 is also called "Labeled Security" and each data object must have a classification
label and each subject a clearence label. On each access attempt, the classification and clearence
are checked to verify that the access is permissable.
C2 is incorrect. C2 is also called "Controlled Access Protection" and only requires that subjects be
individually identified and that security-related events are auditable.
B2 is incorrect. B2 is also called "Structured Protection" and imposes additional controls on
security policy and a more thorough review of system design and implementation.
B3 is incorrect. B3 is also called "Security Domains" and and imposes more granularity in each
protection mechanism.
References:
CBK, pp. 329 - 330
AIO3 pp.302 - 307

The advantages of incremental development include the ease of testing increments of functional capability and the opportunity to incorporate user experience into a successively refined product. The other answers are distracters.

The Three Parts of the Relational Model
The relational model can be considered as having three parts and these are covered in sequence below:
1. Structural: defines the core of the data and the relationships involved. The model structure is described in terms of relations , tuples , attributes and domains .
2. Manipulative: defines how the data in the model will be accessed and manipulated. This concerns how relations in the model will be manipulated to produce other relations, which in turn provide the answer to some question posed by a user of the data. The manipulation is achieved though relational algebra or relational calculus .
3. Constraints: defines limits on the model. The constraints determine valid ranges and values of data to be included in the model.
Reference used for this question:
http://www.diranieh.com/Database/RelationalDatabaseModel.htm#Relational%20Model:%2
0Data%20Manipulation
and
www.macs.hw.ac.uk/~trinder/DbInfSystems/l4RelModel2up.pdf
and
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten
Domains of Computer Security, 2001, John Wiley & Sons, Page 44.