The correct answer is "Physical, permanent connections exist from one point to another in a
circuit-switched network". Permanent connections are a feature of circuit-switched networks.
Note: strictly speaking they aren't physical and they aren't permanent.
A phone call is circuit-switched (well, historically). The circuit wasn't permanent, just for the
duration of the call.

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.

Security is more of a concern in distributed systems since there are
vulnerabilities associated with the network and the many locations
from which unauthorized access to the computing resources can
occur. The other answers are characteristics of a DDP architecture.

Explanation/Reference:
Explanation:
A Business Impact Assessment (BIA) is an analysis that identifies the resources that are critical to an organization's ongoing viability and the threats posed to those resources. It also assesses the likelihood that each threat will actually occur and the impact those occurrences will have on the business.
Identification of priorities is the first step of the business impact assessment process.
Incorrect Answers:
B: Current State Assessment is related to future business planning needs. It is concerned with recovery time of critical business processes.
C: Risk Mitigation Assessment is concerned with recovery time objectives. The Business Impact Assessment addresses the recovery time.
D: Business Risk Assessment is concerned with recovery time objectives. The Business Impact Assessment addresses the recovery time.
References:
Stewart, James M., Ed Tittel, and Mike Chapple, CISSP: Certified Information Systems Security Professional Study Guide, 5th Edition, Sybex, Indianapolis, 2011, p. 825